This documentation is for Dovecot v2.x, see wiki1 for v1.x documentation.

IMAP COMPRESS plugin

The goal of the extension is to reduce the bandwidth usage of IMAP.

The zlib has to be enabled for imap_zlib to work

Configuration:

mail_plugins = $mail_plugins zlib

protocol imap {
  mail_plugins = $mail_plugins imap_zlib
}