I've just spotted on my mail server that all notifications from Sophos Community are rejected due to bad HELO/ELHO. The mail server introduces itself as xxxxxxxx.saas.telligent.com but that name does not exist in DNS so connection is rejected. I know that this kind of check is a little bit strict but it fends off many spammers.
BTW: xxxxx was used to hide the real tenant name.
Correct me if Sophos do not have anything in common with that mailing.
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