migrating from sendmail to postfix. split domain questions

Posted on 2008-11-07
Last Modified: 2013-12-18
I have a server with sendmail 8.10. It is hosting the mail domain
the sendmail server is called
We need to migrate to a new hardware/software platform. So we are moving to centos/postfix.
I need to implement a split domain scenario where the two servers can send/receive email for the same domain while I migrate all the sendmail users to postfix.
So far I have done this:
a- new machine has postfix installed. will receive mail for domain this new machine is called
b- users in are in format
c- users in are in format
d- will be the primary server, getting all mail from internet and sending all mail to internet.
e- when gets email destinated for it will deliver locally
f- when gets email destined for it will deliver via a postfix transport map to the machine.
In the postfix/transport file there will be several lines, one per user, like this:   smtp:[ip_of_sendmail_computer]
With the above line i solve the issue of allowing email received from internet but destined to the old mail server, to be sent correctly.

Now, I need the opposite. Since the migration cannot be done all at once, I need to allow the machine to be able to send to new users in the postfix system.
What will the postfix/transport equivalent be in sendmail?
/etc/mail/somefile that has a line like:    smtp:[ip_of_postfix_machine]

Both systems are using Linux Centos 5.0

Question by:erickperez
    LVL 19

    Accepted Solution

    The sendmail equivelant of the postfix transport file is the mailertable file. should have something like this....

    # Mailer table (overriding domains)
    Kmailertable hash -o /etc/mail/mailertable.db

    LVL 2

    Expert Comment

    You will use alias file, then you wil put lines like


    Of course, sendmail server must be know who is


    Author Comment

    bevhost: my sendmail does not have mailertable (its a sun cube) and no possibilities to install it. I must find another way.

    antoniogc: if I use the alias file, the postfix users need to have a email address?

    LVL 19

    Expert Comment

    Mailertable is a text file.  You can just create it.

    Does the contain any reference to mailertable?

    If not, is there a file?

    Featured Post

    Live: Real-Time Solutions, Start Here

    Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

    Join & Write a Comment

    MS outlook is a premier email client that enable you to send and receive the e-mails with various file formats of attachments such as document files, media file, and many others formats. There is some scenario occurs when a receiver of an e-mail mes…
    Easy CSR creation in Exchange 2007,2010 and 2013
    In this video we show how to create an email address policy in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Mail Flow…
    To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Servers >> Certificates…

    754 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    20 Experts available now in Live!

    Get 1:1 Help Now