Very Computer

Hi,

I currently have one e-mail server for my students which has now reach
3000+ users.  My plan now is to balance the load of the server by
creating another server as we are looking at almost 6000+ users in the
near future.

Server 1 - 123.abc.domain.my with user e-mail will be

Since the new server will be for the same group, i would like to
maintain the e-mail address as the same.

Server 1 - A123.abc.domain.my with user e-mail as

Server 2 - B123.abc.domain.my with user e-mail as

is this possible? does it involved sendmail or DNS or both?  what
about Samba and domain logon?

Thanks.

yeah you can definately do this with sendmail, here is a classic
example...

say you had two mail servers A and B and you had half your users
distributed accross each server, so at a fundamental address space you
could have say...

and

however you still want all users that are sending and reciving to be

and

so there is some server thats talking between the internet and these
other two servers with is acting as your mail relay (could be your
firewall, could be another server).  First you have to have MX records

of which points to the approriate machine.

how you have it set up...if this relay is tottaly in the LAN, then your
LAN DNS entries should reflect this, while your external MX records
should point to your internet gateway/firewall.  if the gateway is the
relay, then both internal and external address will point to the same
machine, just different ethernet interfaces on that machine)

now you want this relay machine to actually do what its meant to.  So
what we want is this.  someone from the outside sends email to say

relay, we then want the relay to say "ok we have recieved mail for
"user-a" for our global domain...ok when i look this up it translates to

for that address space".  it then does a dns lookup, finds the machine

send email out, to send it out with a From and return address header

so first get your sendmail relay set up with xaliases, which will do all

create a sendmail.cf file that will masquerade the entire mail envolope,

then set your A and B machines to forward all external mail or mail

client the sendmail relay machine.

Hi!,

It is possible from the mail perspective.  You will need to configure sendmail
so that it can receive mail for the domain: "123.abc.domain.my" as well as
each machine being able to accept mail for the other machine.  In the DNS, you
will need to specify two MX records so that the machine knows where to send
the mail.  Having them with the same preference may result in the DNS system
doing loading balacning for you, otherwise you may have to implement a small
cluster to handle the mail forwarding/load balancing for you.

As for SAMBA and Domain Logins, it will depend on how it is being done at the
moment.  There isn't enough information in the above outline to provide an
answer on this one.

The real question is, how are you going to unify the mailboxes, is there
another server which is just a disk store where the mailboxes live ?

See ya

Dean Thompson

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