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And also that a 'from' is required if one uses reply-to.
I didn't find that to be the case, since a missing 'From:' line is always generated based on the 'MAIL FROM:' envelope, at least with postfix. The address following 'Reply-To:' probably does not show in your MUA as the originator of the mail, but it's still there in the headers. It's only when you try to repond to the message that the address is used.
I've tried it again with different sequences of 'subject' and 'reply-to' and now it works every time. I guess I made some mistakes in my php-code that caused funny behaviour (reply-to in message instead of in field).
If I do not include the 'from', I do not see a 'from' in the received email. It might be that this is caused by the server; I'm connecting directly to an exchange server (not using sendmail) and cannot change its behavior. I can live with this.
Last edited by Wim Sturkenboom; 06-30-2006 at 12:13 AM.