Use a Web browser to configure the IMAP module. Open the Access page in
the WebAdmin Settings section (realm):
Use the Log setting to specify the type of information the IMAP
module should put in the Server Log. Usually you should use the Major
(message transfer reports) or Problems (message transfer and non-fatal
errors) levels. But when you experience problems with the IMAP module,
you may want to set the Log Level setting to Low-Level or All
Info: in this case protocol-level or link-level details will be recorded
in the System Log as well. When the problem is solved, set the Log Level
setting to its regular value, otherwise your System Log files will grow
in size very quickly.
The IMAP module records in the System Log are marked with the IMAP
tag.
When you specify a non-zero value for the Maximum Number of Channels
setting, the IMAP module creates a so-called "Listener". The
module starts to accept all IMAP connections that mail clients establish
in order to retrieve mail from your server. The setting is used to limit
the number of simultaneous connections the IMAP module can accept. If there
are too many incoming connections open, the module will reject new connections,
and the mail client should retry later.
By default, the IMAP module Listener accepts clear text connections on the
TCP port 143, and secure connections - on the TCP port 993. Follow the
listener link to tune the IMAP Listener.
The IMAP module supports the STARTTLS command that allows client mailers to
establish a connection in the clear text mode and then turn it into a secure connection.
