Murray S. Kucherawy:
> (If this would be better asked on postfix-devel, let me know and I'll repost
> it there.)
>
> What does Postfix do with a message that has a malformed header?
> If for example there's a header that's found to contain a line
> whose first character is alphanumeric (thus not a continuation)
> but contains no colon, is this treated as a header field, or does
> this cause the header to end and the body to begin, or something
> else?
The first line that is "not a header" is considered to be part of
the message body.
Postfix may or may not prepend a blank line to this non-header
line (it always, did but then it was found that it is better not
to insert a blank line in malformed attachments. As of 20070112
Postfix inserts the missing blank line only after the primary
message header).
Wietse
> I'm pretty sure sendmail, for example, ends the header there and
> begins the body such that the malformed line is the first line of
> the body, but I'm wondering what postfix does. If there's consensus
> among popular MTAs about what to do, maybe this should be documented
> someplace more formally.
>
> Thanks,
> -MSK
