/var/log/maillog

[John Levine]

>Sep 26 11:13:47 ethic dovecot: imap-login: Login: user=<kline>, method=PLAIN,
>rip=10.47.0.230, lip=10.47.0.230, TLS
>Sep 26 11:14:48 ethic dovecot: IMAP(kline): Connection closed bytes=824/490

OK, you logged in, checked your mail, and logged out.

>Sep 26 11:15:07 ethic sm-mta[15070]: ruleset=check_relay, arg1=109.106.10.75.sumtel.ua,
>arg2=127.0.0.4, relay=109.106.10.75.sumtel.ua [109.106.10.75], reject=550 5.7.1 Rejected:
>109.106.10.75 listed at sbl-xbl.spamhaus.org
>p1 11:15 <ethic> [4598]                                 

A 'bot in the Ukraine attempted to send mail, and your MTA rejected it
since it was blacklisted.

Those entries are all perfectly normal.  

Not to belabor the obvious, but you need to tell us what you did, what
you expected to happen, what happened instead, and the log entries
showing what was going on while it happened.

R's,
John