If a sending mail server has an A record but it does not have an MX then it would not fail the HELOBOGUS check?
Correct. That is how it actually works in most cases.
For example, if the mailserver for the example.com domain is named mail.example.com, it should really send HELO mail.example.com (or EHLO mail.example.com). In this case, customarily mail.example.com would have an A record but no MX record (since E-mail would not get sent to @mail.example.com).
In the IMail world the customs are a bit different (where Ipswitch often forces people to accept mail to @mail.example.com, in which case an MX record for mail.example.com would be expected (although not required)).
-Scott
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