Mail Server Is Filling Up

[StarTAC]

i have a domain, say user.net and provide e-mail to several users on the mail server... however, the mail server is growing and i need to have a second one, not with a bigger hard drive, but one that will handle the new clients...

how can i work with Linux to be able to know which client's account belongs on which of the two mail servers... ?... because user1 may be on mail server 1 and user2 may be on mail server 2.. when a message is sent to user2@user.net, how can Linux route that mail to mail server 2 instead of mail server 1...

all help will be appreciated...

many thanks

 

[marsd]

There are a couple of ways:
If you are using sendmail you can recompile a config with a virtuser db and other options.
(SAMS sendmail for linux is a good source as
is the info in the sendmail package docs.)
Otherwise you can distribute users across
mail servers by using your /etc/aliases
flat file for redirection.
ex:
user : user@num2.domain.net
user2 : user2@num3.domain.net
etc...
This can be unwieldy with more than a few users.

 

[StarTAC]

thanks alot for the info.. from what u say this alias file would have to reside on the mail server specified as the MX in the DNS server....?..

i would also like to know how i would do this is the mail servers were to be accessible from a web interface running IMAP... how would the program know which server to connect user2 to.. or this depends on the web interface programming...?...

i will have a look at the virtuser db... my distribution is compiled with it...

thanks for all the help though...

 

[marsd]

As far as i know this should be handled
client side.
If the webmail redirects users then it should be able to use virtusers or
the aliases file.

Good Luck