I've started having a lot of problems over the last week with my
mailserver getting blocked for Spam. I can't find any reason why, but
Microsoft/Senderbase/Comcast are blocking me. I'm not on any Blacklists
that I can find, MXToolbox shows it clean on all their blacklist checks,
and it's not on barracuda's list. My Mailserver traffic is normal, so I
don't' think I have any compromised accounts.
I can't find anywhere to check/remove the Microsoft blacklist. The
Returned SMTP Messages just has a Link to their general FAQ page and a
helpful note that says 'We are blocking your email, Contact your network
administrator for assistance'.
Going directly to Senderbase and looking up My server shows the server
clean.
I've already told one customer to move their domain off of me, so I
don't have to answer their hourly calls wondering when it will be fixed,
and I'm getting ready to tell another to leave, since there's nothing
that I can find to fix. But it's always MY fault that someone else is
not accepting their email. It's never up to the person with the Hotmail
or Comcast account complaining to their company that they can't receive
mail from this person.
Did something recently change with some SMTP Protocol or vague DNS check
that I missed updating that the big companies are blacklisting me now?
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