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Hi Andy,

a while ago I changed the MTA to require smtp auth from senders who pretend to 
be one
of our domains. So the mail would get a 5xx type code after the RCTP TO
It turned out that some legitimate mail (in particular ebay bids) came in this 
way and had
to be whitelisted
just to make sure we talk about the same thing. what you mean by "prentend to be one of our domains" means they use your domain in sender addresses. This doesn't mean they use your domain in their helo. The latter is a sign of spam/forgery.

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