Timo,
Yes postfix is configured for SASL so the spammer ip was able to relay email after it obtained the account info. My concern is how the spammer got the user/pass in the 1st place since nowhere on the dovecot logs do I see that particular user attempting to login with the wrong/correct password etc. I should be able to see all login attempts correct if the user/pass was obtained through a dict. attack? Is that's the case then most likely the user/password was obtained from the user's PC and not guessed on the mail server. I am trying to make sense of what happened and to make sure im not overlooking something on dovecot.
-----Original Message----- From: Timo Sirainen [mailto:tss@iki.fi] Sent: Wednesday, November 10, 2010 8:22 PM To: PA Cc: dovecot@dovecot.org Subject: Re: [Dovecot] dovecot dictionary attacks
On 10.11.2010, at 23.03, PA wrote:
However on my smtp mail server that ip is already sending out all sorts of spam with the sasl username of Paramus. This username Paramus never shows up on the dovevot dictionary attack, as a matter of fact the user Paramus is nowhere to be found on the dovecot log at all and I have logs going back months.
I'm just not sure how they guess the username/password as its not on any logs that goes back months and I don't have a dovecot record for that user.
Well, probably obvious, but since you didn't explicitly say: You have configured Postfix to use Dovecot for authentication, not Cyrus SASL, right?..