My first test message to the outside world bounced with:
<[EMAIL PROTECTED]>: host smtp.comcast.net[216.148.227.125] said: 550
[PERMFAIL] comcast.net requires valid sender (in reply to RCPT TO command)
exim always added my "Sender" header for me.
I presume comcast is rejecting your email because it doesn't like the hostname given in the HELO/EHLO command. It saying 'comcast.net requires valid sender' sounds like it. What do 'postconf myorigin' and 'postconf myhostname' say? You (or rather comcast) want myorigin to be a hostname that's in the Internet DNS.
Tobias
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