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Thread: Spammers using my server HELP!

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hi, spammers have been using server 3 days send 1,000's of junk mail, (endless list?). yesterday shut down postfix, keep going queue, 1,500 in 2 hrs., makes me think on server. can install , make work... have no clue where/how start looking aholes this. have had server on 6 yrs , never had problem... customers (2) not happy 15000 failure notices. before had set "only" true users use smtp. there kind of different names in front of domain name. appreciated.

first, should check if server open relay: http://www.spamhelp.org/shopenrelay/

if is, should set smtp-auth possible. if not, should check if spammers abuse 1 of web applications, e.g. through vulnerable contact form, send spam.

also, should check if server blacklisted: http://www.mxtoolbox.com/blacklists.aspx


Forum The Ubuntu Forum Community Ubuntu Specialised Support Security [ubuntu] Spammers using my server HELP!


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