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FAQ.d/FAQ.APPEND_errors.txt
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@ -1,19 +1,19 @@
#!/bin/cat
$Id: FAQ.APPEND_errors.txt,v 1.12 2021/02/10 19:42:42 gilles Exp gilles $
$Id: FAQ.APPEND_errors.txt,v 1.13 2021/05/29 07:58:44 gilles Exp gilles $
This document is also available online at
https://imapsync.lamiral.info/FAQ.d/
https://imapsync.lamiral.info/FAQ.d/FAQ.APPEND_errors.txt
=======================================================================
======================================================================
Dealing with Imapsync APPEND errors.
=======================================================================
======================================================================
Questions answered in this FAQ are:
Q. I have an "could not append" error with "Message contains invalid header" at
the end, like:
Q. I have an "could not append" error with
"Message contains invalid header" at the end, like:
Err 1/20: - msg INBOX/6 {40666} could not append ... NO Message contains invalid header
What can I do to transfer these emails?
@ -23,15 +23,20 @@ Q. For some messages, the imapsync log says
useful message "socket closed while reading data from server"
What can I do?
Q. The append error message is "NO Message contains NUL characters"
What can I do?
Now the questions again with their answers.
=======================================================================
Q. I have an "could not append" error with "Message contains invalid header"
at the end, like:
======================================================================
Q. I have an "could not append" error with
"Message contains invalid header" at the end, like:
Err 1/20: - msg INBOX/6 {40666} could not append ... NO Message contains invalid header
What can I do to transfer these emails?
R0. Append in the IMAP protocol is the command to add a message in the folder.
The error string "NO. Message contains invalid header" comes from the
destination IMAP server at host2, it doesn't like the message and rejects it.
@ -40,12 +45,16 @@ R1. Header lines must be in 7bit encoding.
If they aren't in 7bit the IMAP server can refuse them as they break
the IMAP RFC specification.
A solution is to transform all 8bit characters to the X character with:
A solution is to transform all 8bit characters to the Z character with:
imapsync ... --regexmess 'tr [\x80-\xff] [X]'
imapsync ... --regexmess "tr [\x80-\xff] [Z]"
Caveat: this transformation transforms both the email header and its body.
It's not perfect but I guess it's better than no message transferred.
So consider using it in a second pass, not the first, as 8-bit
characters in the body message are allowed and changing them when
not needed is not a good thing.
R2. Some crappy email systems, like virus checkers or any other crappy
software tool dealing with your messages, can add headers to tell
@ -61,7 +70,7 @@ R2. Some crappy email systems, like virus checkers or any other crappy
Thanks to Damien SAUTEREAU for reporting and solving this issue.
=======================================================================
======================================================================
Q. For some messages, the imapsync log says
"could not append", sometimes followed by an explicit message
describing what went wrong, or sometimes followed by a not very
@ -136,5 +145,22 @@ OPTIONS
R3. Look for the quota limit on host2. If it is the current mailbox size, don't
search elsewhere. Increase the quota on the destination account.
=======================================================================
=======================================================================
======================================================================
Q. The append error message is "NO Message contains NUL characters"
What can I do?
R. Use:
imapsync ... --skipmess "m/(\x00)+\Z/"
The option --skipmess skips messages matching a pattern, the
messages are not synced, you just avoid the error messages concerning
those messages.
If you want to sync them, use instead:
imapsync ... --regexmess "s/(\x00)+\Z//g"
======================================================================
======================================================================