Mailing List Archive: help needed

help needed

antony at tekdiver

Jul 25, 2002, 4:40 AM

Post #1 of 6 (552 views)

Hello again,

I am trying to do the following, is it possible to do with exim 3.3x?

I have a mail server A which handles large amounts of email traffic, and a
second mail server B ( virus scanning ). All domains are set to be delivered
to A, and all mail is sent out through A.

I wish to pass mail for certain domains (that are in a db file) on to mail
server B ( to be scanned) which then will pass the mail back to A (smart
hosting i assume) on which it would be stored/Sent on to the real world ( i
guess this conditional bit could be done through working on and compairing
headers at differant stages).
The bit i am having problems with at the moment is the sending of mail onwards
from A to B,mainly because exim see's the domain as a local domain (which it
is) and so it gets passed on to the directors (rather than routers) and
because of this i cant use the domainlist option (as far as i can tell).

Is it possible to do this, would it be considered as very messy? any better
solutions (mail scanning can not take place on A since the overheads incured
would be concidered too high)

Antony

Re: help needed [ In reply to ]

Jul 25, 2002, 4:49 AM

Post #2 of 6 (542 views)

On Thu, 25 Jul 2002, Antony Carr wrote:

> The bit i am having problems with at the moment is the sending of mail onwards
> from A to B,mainly because exim see's the domain as a local domain (which it
> is) and so it gets passed on to the directors (rather than routers) and
> because of this i cant use the domainlist option (as far as i can tell).

you can use the smartuser driver to force the use of a specific
transport; which, in turn, would be something that forcibly sends the
message to server B.

don't forget to use some condition in that smartuser director, to
prevent loops ($sender_host_address seems to be pretty appropriate)

--
[-]

Re: help needed [ In reply to ]

antony at tekdiver

Jul 25, 2002, 5:13 AM

Post #3 of 6 (544 views)

> you can use the smartuser driver to force the use of a specific
> transport; which, in turn, would be something that forcibly sends the
> message to server B.
Would i be right in guessing the way of doing this would be through piping to
a program, or is there a way of doing this internally, since i do not appear
to be able to use the domainlist driver in a transport.

antony

Re: help needed [ In reply to ]

Jul 25, 2002, 5:13 AM

Post #4 of 6 (547 views)

On Thu, 25 Jul 2002, Antony Carr wrote:

> Would i be right in guessing the way of doing this would be through piping to

no.

:)

> a program, or is there a way of doing this internally, since i do not appear
> to be able to use the domainlist driver in a transport.

you don't need to - see the `hosts' option for the smtp transport.
also check it's docs carefully, it refers you to a couple of other
options you will need to use.

--
[-]

Re: help needed [ In reply to ]

Jul 25, 2002, 5:21 AM

Post #5 of 6 (547 views)

On Thu, 25 Jul 2002, Antony Carr wrote:

>
> > you can use the smartuser driver to force the use of a specific
> > transport; which, in turn, would be something that forcibly sends the
> > message to server B.
> Would i be right in guessing the way of doing this would be through piping to
> a program, or is there a way of doing this internally, since i do not appear
> to be able to use the domainlist driver in a transport.

domainlist is a router, not a transport. Routers (and directors in Exim
3) take decisions; transports carry out the delivery actions.

Your guessing is wrong. Use smartuser to direct to an smtp transport;
the transport defines the destination.

On page 98 of the O'Reilly book there is a section entitled "Virus
Checking on an External Host" which I think covers what you are trying
to do. (But note that the book is for Exim 3 only.)

--
Philip Hazel University of Cambridge Computing Service,
ph10@cus.cam.ac.uk Cambridge, England. Phone: +44 1223 334714.

Re: help needed [ In reply to ]

antony at tekdiver

Jul 26, 2002, 3:23 AM

Post #6 of 6 (545 views)

Just wanted to thank everyone who pointed out my stupidity, and gave me
pointers. Got it all working now, and understand exim a lot better! :)

Cheers,
Antony