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07.24.2008 at 10:05AM PDT, ID: 23592863 | Points: 500
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How do I support receiving email for multiple domains (mycompanydomian.com and corporatedomain.com) using sendmail on linux when the corporatedomain.com belongs to our corporate office?

Asked by papalose in SendMail Email Server, Linux, Linux Administration

I am running a mail server for our company (mycompany.com) on FC5 Linux, Sendmail 8.13.6-0.FC5.1. I am required by our corporate office to receive email for users at our company using the corporate domain (corporatedomain.com). My Sendmail server can only accept email from Postini SPAM proxy service. Our MX records point to Postini. Each local user, localuser@mycompanydomain.com, has an alias to corporate email address, localuser@corporatedomain.com, which gets delivered to my mail server. The trick is sending email to corporate, who is also using Postini, email addresses, corporateuser@corporatedomin.com, that are not local to our Sendmail server.

For example:
localuser@mycompany and localuser@corporatedomain.com needs to come to my server for local delivery. Sent from both local and external clients.

Also:
Internal clients must be able to send email to a corporate address, corporateuser@corporatedomin.com not local to my Sendmail server that is accepting email for the corporatedomain.com.

I've looked at the sendmail virtual hosting table at /etc/mail/virtusertable.db method, but I am stuck at forwarding on nonlocal users to corporate users.

virtusertable.db:

localuser@corporatedomain.com       localuser
@corporatedomain.com                      ????????????????????

I am running two DNS servers. One for internal requests and one for external internet requests. MX records for external DNS requests point to Postini. I am not sure what to do with setting up my DNS for internal requests. Do I point MX records to local mail server of corporate mail server (also Postini).

Any help would be appreciated.

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[+][-]07.24.2008 at 03:10PM PDT, ID: 22084073

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