Good day. I do not from whence (I see no client connection from /var/log/mail.log) the weird letters come, but I see them as:
postfix/qmgr[2589]: 4B59323B3A: from=<>, size=3751, nrcpt=1 (queue active) latter then they are sent: postfix/smtp[8888]: 4B59323B3A: to=<[email protected]>, relay=none, delay=147396, delays=147365/0.07/31/0, dsn=4.4.1, status=deferred (connect to yyyy.zz[aaa.bbb.ccc.dd]:25: Connection timed out) So, can You please help me with the following, how I can: - investigate (debug?) from whence it comes? and - filter/ban it? Thank You for Your time.
