> - limiting maximum outgoing and incoming mail sizes seperately
Not well. You can set an overall size limit, and a limit on each
transport which could do what you want, although I am unsure when the
transport limits kick in (ie I think they may well cause a message to
bounce from within exim, rather than preventing original receipt by
SMTP.
> - limiting sizes based on the recipients' groups (where and however it
> might be defined - doesn't need to be the GID)
You could sort of do this using either a system filter or a smartuser
director with a set of conditional lookups and a fail if
appropriate.... its going to be a mess.
> - limiting sizes based on the recipients
> - limiting relaying based on local sender or the sender's group
> (that is, allowing internet mail access for some, while denying it for
> others)
same as above
> - denying mails from certain senders or to certain recipients
> (incoming
> and outgoing), possibly based on regexp
Yes - exim is strong on this
> - not really required: denying mails with certain attachments'
> extensions (should be solved through virus scanner IMO)
To some extent - exim does not understand MIME. There is a system
filter which does this to a limited degree... its been pretty effective
so far though.
> Does exim support these functions, and to what degree, or does
> anybody know any programs that do?
My own feeling is that I have not seen an environment where the work in
managing this sort of administrative prohibitions has been worth it...
and i would use a stated policy approach and then kick people breaking
it. If they become a real problem they lose email. However I guess
you have reasons for wanting to spend a lot of time on this....
Nigel.
--
[ Nigel Metheringham Nigel.Metheringham@??? ]
[ Phone: +44 1423 850000 Fax +44 1423 858866 ]
[ - Comments in this message are my own and not ITO opinion/policy - ]
