On 13.5.2012, at 13.31, Reindl Harald wrote:

do we really need "session=" additional to proxy log-lines? until this change it was possible on a 24" screen with "tail -f /var/log/maillog" to watch without linebreaks, now each proxy line breaks

PLEASE reconsider such changes!

May 13 12:27:38 mail dovecot: imap-login: proxy(*******@thelounge.net): started proxying to 127.0.0.1:143: user=********@thelounge.net, method=PLAIN, rip=********, lip=******, TLS, session=

For login process lines you can configure this from login_log_format_elements setting.

Anyway the session IDs are especially useful with proxying, since you can match proxy connections to backend connections easily by grepping for the session ID from both logs.