Mail server spam protection

[drevokocur]

@Kindis

Could be that you have a virus issue internally. Review the smtp logs for clues. Also test your smtp server via mxtoolbox and see how many providers have blocked you. Could be a black list provider that is not that “serious”

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Thanks, Im using mxtoolbox. It is the http://cbl.abuseat.org/. Some mails are going trough but some dont.

I have detected a Trojan downloader on one internal PC and the synonymic name was also the Win32/Zbot, so I hope as I have removed it, it will be fine now. I`m waiting for the blacklist refresh now.

I don`t know if it has any connection with this, but I still being bombed with authentification to the mail server. I have blocked now to source ip range 110.53.. so I hope it will be fine now.