#!/bin/cat
$Id: FAQ.APPEND_errors.txt,v 1.6 2019/02/16 22:38:49 gilles Exp gilles $

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https://imapsync.lamiral.info/FAQ.d/FAQ.APPEND_errors.txt

=======================================================================
              Dealing with Imapsync APPEND errors.
=======================================================================

Questions answered in this FAQ are:

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
   useful message "socket closed while reading data from server"
   What can I do?

R0. Well, the problem is that the "socket closed ..." error message happens
    in several different issues. So I list here several potential issues
    and their solutions if they exist.

R1. On Windows, add --regexmess "s,(.{9900}),$1\r\n,g"

Some messages have too long lines; for example, 
Exchange supports only 9900 characters line length.
Use this option to add "new line" characters (also called CRLF)
to wrap lines longer than 9900 characters. 
The regex means "add one CRLF every 9900".

  imapsync.exe ... --regexmess "s,(.{9900}),$1\r\n,g"

R2. On Unix, add --pipemess "reformime -r7". The command reformime
    usually belongs to the package called "maildrop".

  imapsync ... --pipemess "reformime -r7"

I reproduce here the "reformime" manual part explaining what does 
the option "-r7" 

$ man reformime |more
REFORMIME(1)                Double Precision, Inc.                REFORMIME(1)

NAME
       reformime - MIME E-mail reformatting tool

SYNOPSIS
       reformime [options...]

DESCRIPTION
       reformime is a utility for reformatting MIME messages.

       Generally, reformime expects to see an RFC 2045[1] compliant message on
       standard input
...
OPTIONS
...
       -r
           Rewrite message, adding or standardizing RFC 2045[1] MIME headers.

       -r7
           Like -r but also convert 8bit-encoded MIME sections to
           quoted-printable.
...
   Adding RFC 2045 MIME headers
       The -r option performs the following actions:

       If there is no Mime-Version:, Content-Type:, or
       Content-Transfer-Encoding: header, reformime adds one.

       If the Content-Transfer-Encoding: header contains 8bit or raw, but only
       seven-bit data is found, reformime changes the
       Content-Transfer-Encoding header to 7bit.

       -r7 does the same thing, but also converts 8bit-encoded content that
       contains eight-bit characters to quoted-printable encoding.

       
R2.