Mail Routing

[Leif Neland]

    [ The following text is in the "Windows-1252" character set. ]
    [ Your display is set for the "US-ASCII" character set.  ]
    [ Some characters may be displayed incorrectly. ]

Julian Field wrote:
> On 1 Sep 2005, at 07:52, Azher Amin wrote:
>
>> Hi,
>>
>>
>> I have two email servers running sendmail and mailscanner. These
>> are on 2 different DSL links, so if one link goes down then I can
>> atleast keep getting emails from outside. My question is when the
>> link 1 is down then sendmail on serevr 1 keeps the outgoing
>> messages in queue till the link is up again. So in such link outage
>> condition  this server can forward the queued emails to second
>> server whose DSL link is active ??
>>
>>
>> I can do this using smarthost in sendmail, but that I have to do
>> manually, I want to get this auto, plz guide ^Å
>>

> You can do this easily in sendmail using the "FallbackMX" setting. If
> a mail server is trying to deliver to the outside world and can't, it
> sends the mail onto the "FallbackMX" server instead. Which I believe
> is your scenario exactly.
>

But if the host you are trying to send to is down, won't both sendmails try 
to send it to the other, so the mail bounces back between the two until it 
is killed with the message "too many hops"?

You need to only send to the other if the link is down, not if the recipient 
host is down.
So you need some kind of scripting, in connection with your monitoring 
system, eg Big Brother or Nagios.

Leif



-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.
MailScanner thanks transtec Computers for their support.

------------------------ MailScanner list ------------------------
To unsubscribe, email jiscmail at jiscmail.ac.uk with the words:
'leave mailscanner' in the body of the email.
Before posting, read the Wiki (http://wiki.mailscanner.info/) and
the archives (http://www.jiscmail.ac.uk/lists/mailscanner.html).

Support MailScanner development - buy the book off the website!