Hello Folks,

As a part of migration I am proposing different scenarios to my organisation. One which is asked to prepare is to configure multiple mail servers to handle incoming and outgoing mails.

Say I have example.com, I need to have accept mails from incom.example.com and send mail from out.example.com.

can some one guide me what settings are needed on Postfix or on Qmail?

Thanks in advance.

If I understand what you are describing, you are correct in that these are functions of an MTA - Mail Transfer Agent, such as Postfix or QMail.

Unfortunately, setting up a mail server is one of the more complicated things that a server operator can do that involves a tremendous amount of configuration of multiple programs, for example, the MTA itself which runs multiple processes, the POP/IPAM server which is different, a SQL back-end for multiple users, anti-spam plug ins, anti-virus checking, decoders to handle the attachment types for virus scanning, DNS setup for MX records and possibly for SPF records too, and more.

As far as a guide goes, there are several out there. Two common Postfix ones are the one(s) on How-To-Forge and Flurdy.com. As I said above, an email server is a big beast that is tailored to your organization and it is nearly impossible to just 'guide you' on the settings needed at the level you describe.