IMAP server - In Dovecot increase "imap_max_line_length"

Feature
1

From SOGo:

https://sogo.nu/files/docs/SOGoInstallationGuide.html#_microsoft_enterprise_activesync_tuning

…
If you have very large mail folders (thousands of messages), you will need to adjust the word size of your IMAP server. In Dovecot, the parameter to increase is “imap_max_line_length”. We suggest a buffer of 2MB.
…

It is possible on nethserver dovecot ?

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2

I have create in folder /etc/e-smith/templates-custom/etc/dovecot/dovecot.conf the file 90myimap_max_line_length

#
# Increase maximum IMAP command line length
#
imap_max_line_length = 2M

and run

expand-template /etc/dovecot/dovecot.conf

4 Likes
3

Hi Antonio,
nice shot. Thanks for sharing.

4

Thanks for sharing…does someone could test it on a real server and brings back feellings please.

5

from https://www.dovecot.org/doc/dovecot-example.conf

  # Maximum IMAP command line length in bytes. Some clients generate very long
  # command lines with huge mailboxes, so you may need to raise this if you get
  # "Too long argument" or "IMAP command line too large" errors often.
  #imap_max_line_length = 65536
2 Likes
6

please @all can you test the version nethserver-sogo-1.6.8 and report

* Wed Apr 28 2017 Stephane de Labrusse <stephdl@de-labrusse.fr> - 1.6.8-1
- Increase maximum IMAP command line length
- Sogo session are dropped after 24h
- Adjusted sogo cron.d, sieve credentials are in /etc/sogo/sieve.creds

yum install nethserver-sogo --enablerepo=nethforge-testing

7

Perfect thanks !

I’m testing on my server
The client with outlook 2010 in imap is faster in sync

8

I would change the file
/etc/e-smith/templates/etc/dovecot/dovecot.conf/90myimap_max_line_length in
/etc/e-smith/templates/etc/dovecot/dovecot.conf/90imap_max_line_length

#
# 90imap_max_line_length Increase the maximum IMAP command line length
#
# Maximum IMAP command line length in bytes. Some clients generate very long
# Command lines with huge mailboxes, so you may need to raise this if you get
# "Too long argument" or "IMAP command line too large".
Imap_max_line_length = {$ {'dovecot'} {'ImapMaxLineLenght'} || '2048'} k
1 Like
9

new version available in nethforge-testing with the typo corrected in the file name

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10

bump…tests waited

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11

For me it works well, tested on 2 servers with outlook 2010 client

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