I client recently had one of our emails rejected (html email with invoice pdf attached), all clean.
I asked them to look into it and they found it in their external Minecast spam trap. The rejection information supplied is..
Rejection Type: 14080
Rejection Description: Spam Signature Description
Rejection Information: MCSpamSignature.sa.s.39.5
We don't have any more information than that. I've done some Googling around but cant find any details of what MCSpamSignature.sa.s.39.5 relates to and as we don't have Mimecast I cant investigate on our own systems.
Does anyone know what this relates to?
Many thanks in advance!