Doesn'T Support Auth Or The Specified Sasl Handlers! Password Thanks Michaeltc

Click to expand. If I dont change config, how can I know the user name of SASL login failed Thanks Michaeltc.

Hi all: Im follow the below link to setup I think the maillog come from postfixDovecot, if the spammer try to hack the account, the maillog will show postfixsmtpd5556: warning: unknownxx.34.55.xxx: SASL LOGIN authentication failed: UGFzc3dvcmQ6 My question is, how to show the user name for this SASL LOGIN authentication failed: UGFzc3dvcmQ6 E.g.

If you get too much verbose output, then just try authverbose only.

Doesn'T Support Auth Or The Specified Sasl Handlers! Password Thanks Michaeltc

As we can know which email account are in high risk and let me to do more step to prevent hacker try to hack password Thanks Michaeltc.

SASL LOGIN authentication failed hacked but it indicate some guest try to connect our smtp server to send spam email, but the password is wrong will cause postfixsmtpd6942: warning: unknownxxx.xxx.xxx.xxx: SASL LOGIN authentication failed: UGFzc3dvcmQ6 Michaeltc.

You say it means hacked Below, someone says, it indicates a failed attempt to send spam (wrong password).

David, is technical language for does not equal, so in this case, the SASL LOGIN authentication failed message doesnt mean the account has been hacked.

It could be a brute-force hack attempt, but its not getting through.

I can log the sasl sql query separately, but its not a good solution because I cant surely link the failure log to the query.

Thanks, but the the problem is with postfix not logging SASL failed username Gabor.

I dont understand that In your post above you have a perfectly fine log line which will be found by the posted code Steini86.

Click to expand. If I knew the username I could set more aggressive firewall beahvior when one IP probing different usernames.

I could be sure it is not a regular user trying to login.

I dont know what its like where you are, but in the uk, if youre providing an email service to customers, youre legally required to keep records of all mail transactions for at least a year.

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