Best Practices for SMTP Blocking?

We often take advantage of SMTP Blocking to block known EHLO domains from spammers and scammers with use of astericus as a joker.

Example:

host1.domain.com

host2.domain.com

host3.domain.com ... and so on.

So we put a block record for "*.domain.com".

If we only add "domain.com" will be suffice in this case?

In some cases we get

host1.domainhs1.com

host1.domainhs2.com

host1.domainhs3.com...

results in a "*.domainhs*.com" record added.

We have a good success rates with this approach, but in some cases the SMTP Block is skipped.

Also with blocking list getting bigger and bigger I worry some impact on performance. Whats your thoughts?

Employee Replied

10/11/2016 at 12:21 PM

Employee Post Marked As Answer

Hi Lucidio. If you'd like to block SMTP connections from any address at a domain, you could use *@domain.com at Security >> Advanced Settings >> SMTP Blocking.

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