On Wed, 5 May 1999, Info-LabVIEW List Maintainer wrote:
> John Levine:
> >> I can't tell from RFC822 if Date is a required field or not
> >> 'cause all that meta notation makes my eyes glaze over.
> >According to RFC822, the date header is required, but I've never seen an
> >MTA that would reject a message for lacking a date.
> Oh, they're out there. Seemingly, a lot of them in Europe (don't ask how I
> came to that conclusion, it's just an observation).
exim, http://www.exim.org/ , has a feature for checking header syntax and
complience and optionally rejecting mail with malformed headers. A couple
of years ago, one could catch a fair about of spam that way, without too
many false positives. Then Outlook came along and spammers produced
better headers, so things reversed. So while exim has these feature, I
don't think that anyone is using it on anything other than outgoing mail
now. It is a feature which is off by default.
Also, I've seen that some versions of a VMS mailer MX will reject mail
with some malformed headers.
Jeffrey Goldberg +44 (0)1234 750 111 x 2826
Cranfield Computer Centre FAX 751 814
Relativism is the triumph of authority over truth, convention over justice.