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