diff --git a/src/registrar/admin.py b/src/registrar/admin.py
index eccfa1750..174500f28 100644
--- a/src/registrar/admin.py
+++ b/src/registrar/admin.py
@@ -138,24 +138,12 @@ class MyUserAdmin(BaseUserAdmin):
         "email",
         "first_name",
         "last_name",
+        # Group is a custom property defined within this file,
+        # rather than in a model like the other properties
         "group",
         "status",
     )
 
-    list_filter = (
-        "is_active",
-        "groups",
-    )
-
-    # Let's define First group
-    # (which should in theory be the ONLY group)
-    def group(self, obj):
-        if obj.groups.filter(name="full_access_group").exists():
-            return "Full access"
-        elif obj.groups.filter(name="cisa_analysts_group").exists():
-            return "Analyst"
-        return ""
-
     fieldsets = (
         (
             None,
@@ -222,6 +210,20 @@ class MyUserAdmin(BaseUserAdmin):
         "date_joined",
     ]
 
+    list_filter = (
+        "is_active",
+        "groups",
+    )
+
+    # Let's define First group
+    # (which should in theory be the ONLY group)
+    def group(self, obj):
+        if obj.groups.filter(name="full_access_group").exists():
+            return "Full access"
+        elif obj.groups.filter(name="cisa_analysts_group").exists():
+            return "Analyst"
+        return ""
+
     def get_list_display(self, request):
         # The full_access_permission perm will load onto the full_access_group
         # which is equivalent to superuser. The other group we use to manage
@@ -811,7 +813,8 @@ class DomainAdmin(ListHeaderAdmin):
         else:
             self.message_user(
                 request,
-                ("Domain statuses are %s" ". Thanks!") % statuses,
+                f"The registry statuses are {statuses}. "
+                "These statuses are from the provider of the .gov registry.",
             )
         return HttpResponseRedirect(".")
 
diff --git a/src/registrar/forms/domain.py b/src/registrar/forms/domain.py
index f14448bcf..2f9aa1976 100644
--- a/src/registrar/forms/domain.py
+++ b/src/registrar/forms/domain.py
@@ -64,7 +64,7 @@ class DomainSecurityEmailForm(forms.Form):
 
     """Form for adding or editing a security email to a domain."""
 
-    security_email = forms.EmailField(label="Security email")
+    security_email = forms.EmailField(label="Security email", required=False)
 
 
 class DomainOrgNameAddressForm(forms.ModelForm):
diff --git a/src/registrar/models/domain.py b/src/registrar/models/domain.py
index 59edb707a..649eaed07 100644
--- a/src/registrar/models/domain.py
+++ b/src/registrar/models/domain.py
@@ -15,7 +15,7 @@ from epplibwrapper import (
     RegistryError,
     ErrorCode,
 )
-from registrar.models.utility.contact_error import ContactError
+from registrar.models.utility.contact_error import ContactError, ContactErrorCodes
 
 from .utility.domain_field import DomainField
 from .utility.domain_helper import DomainHelper
@@ -625,7 +625,10 @@ class Domain(TimeStampedModel, DomainHelper):
     def get_security_email(self):
         logger.info("get_security_email-> getting the contact ")
         secContact = self.security_contact
-        return secContact.email
+        if secContact is not None:
+            return secContact.email
+        else:
+            return None
 
     def clientHoldStatus(self):
         return epp.Status(state=self.Status.CLIENT_HOLD, description="", lang="en")
@@ -698,10 +701,10 @@ class Domain(TimeStampedModel, DomainHelper):
             return None
 
         if contact_type is None:
-            raise ContactError("contact_type is None")
+            raise ContactError(code=ContactErrorCodes.CONTACT_TYPE_NONE)
 
         if contact_id is None:
-            raise ContactError("contact_id is None")
+            raise ContactError(code=ContactErrorCodes.CONTACT_ID_NONE)
 
         # Since contact_id is registry_id,
         # check that its the right length
@@ -710,14 +713,10 @@ class Domain(TimeStampedModel, DomainHelper):
             contact_id_length > PublicContact.get_max_id_length()
             or contact_id_length < 1
         ):
-            raise ContactError(
-                "contact_id is of invalid length. "
-                "Cannot exceed 16 characters, "
-                f"got {contact_id} with a length of {contact_id_length}"
-            )
+            raise ContactError(code=ContactErrorCodes.CONTACT_ID_INVALID_LENGTH)
 
         if not isinstance(contact, eppInfo.InfoContactResultData):
-            raise ContactError("Contact must be of type InfoContactResultData")
+            raise ContactError(code=ContactErrorCodes.CONTACT_INVALID_TYPE)
 
         auth_info = contact.auth_info
         postal_info = contact.postal_info
@@ -881,8 +880,8 @@ class Domain(TimeStampedModel, DomainHelper):
 
             return self._handle_registrant_contact(desired_contact)
 
-        _registry_id: str
-        if contact_type in contacts:
+        _registry_id: str = ""
+        if contacts is not None and contact_type in contacts:
             _registry_id = contacts.get(contact_type)
 
         desired = PublicContact.objects.filter(
diff --git a/src/registrar/models/utility/contact_error.py b/src/registrar/models/utility/contact_error.py
index 93084eca2..cf392cb6e 100644
--- a/src/registrar/models/utility/contact_error.py
+++ b/src/registrar/models/utility/contact_error.py
@@ -1,2 +1,51 @@
+from enum import IntEnum
+
+
+class ContactErrorCodes(IntEnum):
+    """Used in the ContactError class for
+    error mapping.
+
+    Overview of contact error codes:
+        - 2000 CONTACT_TYPE_NONE
+        - 2001 CONTACT_ID_NONE
+        - 2002 CONTACT_ID_INVALID_LENGTH
+        - 2003 CONTACT_INVALID_TYPE
+    """
+
+    CONTACT_TYPE_NONE = 2000
+    CONTACT_ID_NONE = 2001
+    CONTACT_ID_INVALID_LENGTH = 2002
+    CONTACT_INVALID_TYPE = 2003
+    CONTACT_NOT_FOUND = 2004
+
+
 class ContactError(Exception):
-    ...
+    """
+    Overview of contact error codes:
+        - 2000 CONTACT_TYPE_NONE
+        - 2001 CONTACT_ID_NONE
+        - 2002 CONTACT_ID_INVALID_LENGTH
+        - 2003 CONTACT_INVALID_TYPE
+        - 2004 CONTACT_NOT_FOUND
+    """
+
+    # For linter
+    _contact_id_error = "contact_id has an invalid length. Cannot exceed 16 characters."
+    _contact_invalid_error = "Contact must be of type InfoContactResultData"
+    _contact_not_found_error = "No contact was found in cache or the registry"
+    _error_mapping = {
+        ContactErrorCodes.CONTACT_TYPE_NONE: "contact_type is None",
+        ContactErrorCodes.CONTACT_ID_NONE: "contact_id is None",
+        ContactErrorCodes.CONTACT_ID_INVALID_LENGTH: _contact_id_error,
+        ContactErrorCodes.CONTACT_INVALID_TYPE: _contact_invalid_error,
+        ContactErrorCodes.CONTACT_NOT_FOUND: _contact_not_found_error,
+    }
+
+    def __init__(self, *args, code=None, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.code = code
+        if self.code in self._error_mapping:
+            self.message = self._error_mapping.get(self.code)
+
+    def __str__(self):
+        return f"{self.message}"
diff --git a/src/registrar/templates/django/admin/domain_change_form.html b/src/registrar/templates/django/admin/domain_change_form.html
index ac26fc922..2ed3d7532 100644
--- a/src/registrar/templates/django/admin/domain_change_form.html
+++ b/src/registrar/templates/django/admin/domain_change_form.html
@@ -13,10 +13,10 @@
         {% elif original.state == original.State.ON_HOLD %}
           <input type="submit" value="Remove hold" name="_remove_client_hold">
         {% endif %}
-        <input id="manageDomainSubmitButton" type="submit" value="Manage Domain" name="_edit_domain">
-        <input type="submit" value="get status" name="_get_status">
+        <input id="manageDomainSubmitButton" type="submit" value="Manage domain" name="_edit_domain">
+        <input type="submit" value="Get registry status" name="_get_status">
         {% if original.state != original.State.DELETED %}
-        <input type="submit" value="Delete Domain in Registry" name="_delete_domain">
+        <input type="submit" value="Delete domain in registry" name="_delete_domain">
         {% endif %}
     </div>
     {{ block.super }}
diff --git a/src/registrar/templates/domain_detail.html b/src/registrar/templates/domain_detail.html
index 6a700b393..bcf775fe5 100644
--- a/src/registrar/templates/domain_detail.html
+++ b/src/registrar/templates/domain_detail.html
@@ -46,8 +46,11 @@
     {% include "includes/summary_item.html" with title='Your contact information' value=request.user.contact contact='true' edit_link=url %}
 
     {% url 'domain-security-email' pk=domain.id as url %}
-    {% include "includes/summary_item.html" with title='Security email' value=domain.security_email edit_link=url %}
-
+    {% if security_email is not None and security_email != default_security_email%}
+      {% include "includes/summary_item.html" with title='Security email' value=security_email edit_link=url %}
+    {% else %}
+      {% include "includes/summary_item.html" with title='Security email' value='None provided' edit_link=url %}
+    {% endif %}
     {% url 'domain-users' pk=domain.id as url %}
     {% include "includes/summary_item.html" with title='User management' users='true' list=True value=domain.permissions.all edit_link=url %}
 
diff --git a/src/registrar/templates/domain_nameservers.html b/src/registrar/templates/domain_nameservers.html
index 2dabac1af..a7371ee0b 100644
--- a/src/registrar/templates/domain_nameservers.html
+++ b/src/registrar/templates/domain_nameservers.html
@@ -1,7 +1,7 @@
 {% extends "domain_base.html" %}
 {% load static field_helpers%}
 
-{% block title %}Domain name servers | {{ domain.name }} | {% endblock %}
+{% block title %}DNS name servers | {{ domain.name }} | {% endblock %}
 
 {% block domain_content %}
   {# this is right after the messages block in the parent template #}
@@ -9,7 +9,7 @@
     {% include "includes/form_errors.html" with form=form %}
   {% endfor %}
 
-  <h1>Domain name servers</h1>
+  <h1>DNS name servers</h1>
 
   <p>Before your domain can be used we'll need information about your domain
   name servers.</p>
diff --git a/src/registrar/templates/domain_security_email.html b/src/registrar/templates/domain_security_email.html
index 8175fa394..8fb0ccfb0 100644
--- a/src/registrar/templates/domain_security_email.html
+++ b/src/registrar/templates/domain_security_email.html
@@ -1,18 +1,16 @@
 {% extends "domain_base.html" %}
 {% load static field_helpers url_helpers %}
 
-{% block title %}Domain security email | {{ domain.name }} | {% endblock %}
+{% block title %}Security email | {{ domain.name }} | {% endblock %}
 
 {% block domain_content %}
 
-  <h1>Domain security email</h1>
+  <h1>Security email</h1>
 
   <p>We strongly recommend that you provide a security email. This email will allow the  public to report observed or suspected security issues on your domain. Security emails are made public and included in the <a href="{% public_site_url 'about/data/' %}">.gov domain data</a> we provide.</p>
 
   <p>A security contact should be capable of evaluating or triaging security reports for your entire domain. Use a team email address, not an individual’s email. We recommend using an alias, like security@domain.gov.</p>
 
-  {% include "includes/required_fields.html" %}
-
   <form class="usa-form usa-form--large" method="post" novalidate>
     {% csrf_token %}
 
diff --git a/src/registrar/templates/domain_your_contact_information.html b/src/registrar/templates/domain_your_contact_information.html
index 81c62584c..e2cad735f 100644
--- a/src/registrar/templates/domain_your_contact_information.html
+++ b/src/registrar/templates/domain_your_contact_information.html
@@ -1,11 +1,11 @@
 {% extends "domain_base.html" %}
 {% load static field_helpers %}
 
-{% block title %}Domain contact information | {{ domain.name }} | {% endblock %}
+{% block title %}Your contact information | {{ domain.name }} | {% endblock %}
 
 {% block domain_content %}
 
-  <h1>Domain contact information</h1>
+  <h1>Your contact information</h1>
 
 <p>If you’d like us to use a different name, email, or phone number you can make those changes below. <strong>Updating your contact information here will update the contact information for all domains in your account.</strong> However, it won’t affect your Login.gov account information.
 </p>
diff --git a/src/registrar/tests/test_admin.py b/src/registrar/tests/test_admin.py
index dd87a003a..51ace34f7 100644
--- a/src/registrar/tests/test_admin.py
+++ b/src/registrar/tests/test_admin.py
@@ -109,12 +109,12 @@ class TestDomainAdmin(MockEppLib):
         )
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, domain.name)
-        self.assertContains(response, "Delete Domain in Registry")
+        self.assertContains(response, "Delete domain in registry")
 
         # Test the info dialog
         request = self.factory.post(
             "/admin/registrar/domain/{}/change/".format(domain.pk),
-            {"_delete_domain": "Delete Domain in Registry", "name": domain.name},
+            {"_delete_domain": "Delete domain in registry", "name": domain.name},
             follow=True,
         )
         request.user = self.client
@@ -149,12 +149,12 @@ class TestDomainAdmin(MockEppLib):
         )
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, domain.name)
-        self.assertContains(response, "Delete Domain in Registry")
+        self.assertContains(response, "Delete domain in registry")
 
         # Test the error
         request = self.factory.post(
             "/admin/registrar/domain/{}/change/".format(domain.pk),
-            {"_delete_domain": "Delete Domain in Registry", "name": domain.name},
+            {"_delete_domain": "Delete domain in registry", "name": domain.name},
             follow=True,
         )
         request.user = self.client
@@ -194,12 +194,12 @@ class TestDomainAdmin(MockEppLib):
         )
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, domain.name)
-        self.assertContains(response, "Delete Domain in Registry")
+        self.assertContains(response, "Delete domain in registry")
 
         # Test the info dialog
         request = self.factory.post(
             "/admin/registrar/domain/{}/change/".format(domain.pk),
-            {"_delete_domain": "Delete Domain in Registry", "name": domain.name},
+            {"_delete_domain": "Delete domain in registry", "name": domain.name},
             follow=True,
         )
         request.user = self.client
@@ -221,7 +221,7 @@ class TestDomainAdmin(MockEppLib):
         # Test the info dialog
         request = self.factory.post(
             "/admin/registrar/domain/{}/change/".format(domain.pk),
-            {"_delete_domain": "Delete Domain in Registry", "name": domain.name},
+            {"_delete_domain": "Delete domain in registry", "name": domain.name},
             follow=True,
         )
         request.user = self.client
diff --git a/src/registrar/tests/test_models_domain.py b/src/registrar/tests/test_models_domain.py
index 50456c2d5..46a6de004 100644
--- a/src/registrar/tests/test_models_domain.py
+++ b/src/registrar/tests/test_models_domain.py
@@ -16,6 +16,7 @@ from registrar.models.domain_information import DomainInformation
 from registrar.models.draft_domain import DraftDomain
 from registrar.models.public_contact import PublicContact
 from registrar.models.user import User
+from registrar.models.utility.contact_error import ContactError, ContactErrorCodes
 from .common import MockEppLib
 from django_fsm import TransitionNotAllowed  # type: ignore
 from epplibwrapper import (
@@ -193,6 +194,56 @@ class TestDomainCache(MockEppLib):
         self.assertEqual(cached_contact, in_db.registry_id)
         self.assertEqual(domain.security_contact.email, "123test@mail.gov")
 
+    def test_errors_map_epp_contact_to_public_contact(self):
+        """
+        Scenario: Registrant gets invalid data from EPPLib
+            When the `map_epp_contact_to_public_contact` function
+                gets invalid data from EPPLib
+            Then the function throws the expected ContactErrors
+        """
+        domain, _ = Domain.objects.get_or_create(name="registry.gov")
+        fakedEpp = self.fakedEppObject()
+        invalid_length = fakedEpp.dummyInfoContactResultData(
+            "Cymaticsisasubsetofmodalvibrationalphenomena", "lengthInvalid@mail.gov"
+        )
+        valid_object = fakedEpp.dummyInfoContactResultData("valid", "valid@mail.gov")
+
+        desired_error = ContactErrorCodes.CONTACT_ID_INVALID_LENGTH
+        with self.assertRaises(ContactError) as context:
+            domain.map_epp_contact_to_public_contact(
+                invalid_length,
+                invalid_length.id,
+                PublicContact.ContactTypeChoices.SECURITY,
+            )
+        self.assertEqual(context.exception.code, desired_error)
+
+        desired_error = ContactErrorCodes.CONTACT_ID_NONE
+        with self.assertRaises(ContactError) as context:
+            domain.map_epp_contact_to_public_contact(
+                valid_object,
+                None,
+                PublicContact.ContactTypeChoices.SECURITY,
+            )
+        self.assertEqual(context.exception.code, desired_error)
+
+        desired_error = ContactErrorCodes.CONTACT_INVALID_TYPE
+        with self.assertRaises(ContactError) as context:
+            domain.map_epp_contact_to_public_contact(
+                "bad_object",
+                valid_object.id,
+                PublicContact.ContactTypeChoices.SECURITY,
+            )
+        self.assertEqual(context.exception.code, desired_error)
+
+        desired_error = ContactErrorCodes.CONTACT_TYPE_NONE
+        with self.assertRaises(ContactError) as context:
+            domain.map_epp_contact_to_public_contact(
+                valid_object,
+                valid_object.id,
+                None,
+            )
+        self.assertEqual(context.exception.code, desired_error)
+
 
 class TestDomainCreation(MockEppLib):
     """Rule: An approved domain application must result in a domain"""
diff --git a/src/registrar/tests/test_views.py b/src/registrar/tests/test_views.py
index 68aaf0ed8..2194b42db 100644
--- a/src/registrar/tests/test_views.py
+++ b/src/registrar/tests/test_views.py
@@ -1309,7 +1309,7 @@ class TestDomainDetail(TestWithDomainPermissions, WebTest, MockEppLib):
         page = self.client.get(
             reverse("domain-nameservers", kwargs={"pk": self.domain.id})
         )
-        self.assertContains(page, "Domain name servers")
+        self.assertContains(page, "DNS name servers")
 
     @skip("Broken by adding registry connection fix in ticket 848")
     def test_domain_nameservers_form(self):
@@ -1414,7 +1414,7 @@ class TestDomainDetail(TestWithDomainPermissions, WebTest, MockEppLib):
         page = self.client.get(
             reverse("domain-your-contact-information", kwargs={"pk": self.domain.id})
         )
-        self.assertContains(page, "Domain contact information")
+        self.assertContains(page, "Your contact information")
 
     def test_domain_your_contact_information_content(self):
         """Logged-in user's contact information appears on the page."""
@@ -1439,7 +1439,7 @@ class TestDomainDetail(TestWithDomainPermissions, WebTest, MockEppLib):
         )
 
         # Loads correctly
-        self.assertContains(page, "Domain security email")
+        self.assertContains(page, "Security email")
         self.assertContains(page, "security@mail.gov")
         self.mockSendPatch.stop()
 
@@ -1455,7 +1455,7 @@ class TestDomainDetail(TestWithDomainPermissions, WebTest, MockEppLib):
         )
 
         # Loads correctly
-        self.assertContains(page, "Domain security email")
+        self.assertContains(page, "Security email")
         self.assertNotContains(page, "dotgov@cisa.dhs.gov")
         self.mockSendPatch.stop()
 
@@ -1464,7 +1464,7 @@ class TestDomainDetail(TestWithDomainPermissions, WebTest, MockEppLib):
         page = self.client.get(
             reverse("domain-security-email", kwargs={"pk": self.domain.id})
         )
-        self.assertContains(page, "Domain security email")
+        self.assertContains(page, "Security email")
 
     def test_domain_security_email_form(self):
         """Adding a security email works.
diff --git a/src/registrar/views/domain.py b/src/registrar/views/domain.py
index d8c3c80fa..4ea3d2fbc 100644
--- a/src/registrar/views/domain.py
+++ b/src/registrar/views/domain.py
@@ -21,6 +21,7 @@ from registrar.models import (
     User,
     UserDomainRole,
 )
+from registrar.models.public_contact import PublicContact
 
 from ..forms import (
     ContactForm,
@@ -42,6 +43,19 @@ class DomainView(DomainPermissionView):
 
     template_name = "domain_detail.html"
 
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+
+        default_email = Domain().get_default_security_contact().email
+        context["default_security_email"] = default_email
+
+        security_email = self.get_object().get_security_email()
+        if security_email is None or security_email == default_email:
+            context["security_email"] = None
+            return context
+        context["security_email"] = security_email
+        return context
+
 
 class DomainOrgNameAddressView(DomainPermissionView, FormMixin):
     """Organization name and mailing address view"""
@@ -284,10 +298,21 @@ class DomainSecurityEmailView(DomainPermissionView, FormMixin):
         """The form is valid, call setter in model."""
 
         # Set the security email from the form
-        new_email = form.cleaned_data.get("security_email", "")
+        new_email: str = form.cleaned_data.get("security_email", "")
+
+        # If we pass nothing for the sec email, set to the default
+        if new_email is None or new_email.strip() == "":
+            new_email = PublicContact.get_default_security().email
 
         domain = self.get_object()
         contact = domain.security_contact
+
+        # If no default is created for security_contact,
+        # then we cannot connect to the registry.
+        if contact is None:
+            messages.error(self.request, "Update failed. Cannot contact the registry.")
+            return redirect(self.get_success_url())
+
         contact.email = new_email
         contact.save()