Hello,

I just happened to be looking at the logs when I saw something odd...

Virtually every log entry showing an IMAP connection is followed
immediately by a LOGIN username entry, like so:

May  2 14:26:23 myhost imapd-ssl: Connection, ip=[::ffff:166.137.15.208]
May  2 14:26:24 myhost imapd-ssl: LOGIN, [email protected],
ip=[::ffff:166.137.15.208], port=[31770], protocol=IMAP

But I happened to notice these two lines when looking at the logs for
something else:

May  2 14:26:44 myhost imapd-ssl: Connection, ip=[::ffff:166.137.9.4]
May  2 14:26:45 myhost imapd-ssl: LOGOUT, ip=[::ffff:166.137.9.4],
rcvd=60, sent=356

Every other LOGOUT entry is formatted like:

May  2 14:30:32 myhost imapd-ssl: LOGOUT, [email protected],
ip=[::ffff:67.223.90.245], headers=934, body=0, rcvd=561, sent=5312,
time=1, starttls=1

So, what are these? I grepped the logs and there are a bunch of entries
just like I showed for that IP address (real, not obfuscated, apparently
a mycingular wireless address)...

Is this some kind of 'keep-alive' from someone's phone? If so, why
doesn't the LOGOUT entry show their username?

Any feedback is appreciated...

-- 

Best regards,

Charles

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