Hello List,

i have much trouble sending to comcast Mailservers. The comcast Servers returns "450 [TEMPFAIL] comcast.net requires valid sender domain". Sometimes the mail goes thru after a few hours but mostly not. What i can see with ngrep is that my exim must wait a long time for Return Messages and then send line to the comcast servers like this

"From:<[EMAIL PROTECTED]> To:<[EMAIL PROTECTED]> ..."
and does not wait for return code, so comacst servers saw the To-Header not correctly. I think that the problem is on comcast Side but how to explain my customers.

Anybody an idea?

Regards

Tom

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