[Exim] beeing an MX backup for a friend

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Author: Otavio Exel
Date:  
To: Exim mailing list
Subject: [Exim] beeing an MX backup for a friend
hello eximmers,

I would like to use my mailserver to help a friend that has a mailserver
behind a very unreliable internet connection; both servers are exim 2.05
on debian 2.1; AFAIK what I have to do is:

- config DNS so that, if his connection is down, mail for his domain
will arrive at my box;

- in my exim config I have to:
  - list his domain in relay_domains
  - define a special set of retry rules for his domain so that mail will
    sit here until his connection comes up instead of returning an error
    message;


my questions are:

- is this what is called an "MX backup"?

- is there a 'standard' set of retry rules for this situation?

- is there a way for his box to send me a request for a queue run as
soon as its connection is re-established?

- is there anything more to be done? how would exim handle the following
  situation: a domain called domain.com has two 'MX backups' like in..
    @  IN  MX  10 mail.domain.com
    @  IN  MX  20 mail.friend-a.com
    @  IN  MX  20 mail.friend-b.com
  if mail.domain.com is unavailable, then mail.friend-a.com has to know
  that it should wait for mail.domain.com to come up instead of sending
  messages to mail.friend-b.com thus creating a loop!


thanks for reading this far!

beers,

--
Otavio Exel /<\oo/>\ oexel@???