XPost: comp.mail.sendmail
"ClausAßmann" wrote in message news:5710e272$0$44984$
742ec2ed@news.sonic.net...
Dave DeHanas wrote:
Is a Reply-To header field required, and is "Reply-To: <>" valid?
1. This newsgroup is about the sendmail program, not generic e-mail
questions.
2. There are RFCs that specify the format of e-mail, e.g., RFC 2822 et.al.
Have you checked those?
...
===============
[Note the follow-up to group.]
In addition to that which is stated in the RFC, certain other "valid" constructs will be treated as spam.
E.g. "Reply-To: <
x@y.invalid>" - Use of the ".invalid" TLD in an optional header is a clear sign of spam. That is not in any RFC (other than implied
in RFCs 2606 and 6761).
A "null" mailbox such as "<>" would also be considered spam. A null mailbox
is valid only in the SMTP MAIL FROM statement, not message headers.
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