Best Practices for SMTP Blocking?
Question asked by Lucidio Arruda Neto - October 11, 2016 at 11:05 AM
Answered
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?
 
 
 
 

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Rod Lasky Replied
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.
Rod Lasky
Technical Support Specialist
SmarterTools Inc.
(877) 357-6278
www.smartertools.com

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