> RFC2822 section 2.1.1 says "Each line of characters MUST be no more
> than 998 characters".
>
> By default exim does not reject messages which fail to comply with
> this requirement. I have searched the documentation and cannot find
> any option which would reject messages which do not comply.
>
> Is there such an option?
>
> I have only ever seen spam messages which exceed the limit so, if all
> the popular e-mail clients are compliant, this would be another weapon
> in the fight against spam.
>
If you compile exim with exiscan, you can use
deny message = line longer than 999 characters
regex = ^.{1000,}
in the DATA acl. It's probably wise to restrict this check to
messages below a certain size.
The line length check was introduced here because we have a mail
client that chokes on lines that are too long.
I observed non-spam messages created by webmailers containing HTML
code with no line breaks at all, so it can be a problem to suppress
such messages.
---
Peter Rindfuss
Wissenschaftszentrum Berlin fuer Sozialforschung
(Social Science Research Center Berlin, Germany)
email: rindfuss@???
phone: +49-30-25491-566 fax: +49-30-25491-558
