How to block a sending mail server?
Question asked by Michael Graveen - 2/16/2024 at 4:07 PM
I want to block the sending mail servers from sparkpostmail.com.  They send a lot of SPAM.  The offending MTA is usually in the form of "mta-XXX-XXX-XXX.sparkpostmail.com", where XXX is a IP octet.  Can I block something like this?  If so, how would I do it?

I am using SmarterMail build 8776.(free version).



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J. LaDow Replied
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We use EHLO blocks for something like that with a wildcard - but keep an eye on the logs for a while to make sure you don't trap something else accidentally.

We block probably about 2 dozen "nothing-but-spam" top level extensions this way.

Another thing you can do is a custom spam check that assigns those mails a ridiculously high spam score then they're blocked by the spam filters.
MailEnable survivor / convert --
Michael Graveen Replied
Hi J. LaDow, 
Thanks for your reply.  I did create a SMTP Block for the "*.sparkpostmail.com" MTA.  It seems to be doing the trick.  I will monitor the logs.


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