Need help to "virtual host" one of my domains

[wpwood3]

I have a Windows web server (Server-B) that currently has DNS and mail handled by someone else. Let's say the domain is allparts.com

I also have a linux server (Server-A) running ISPConfig, CentOS, Postfix and Dovecot (Perfect Server) that handles my other domains. Let's say the domain here is myshop.com

What I want to do is change the nameservers at my domain registrar to point allparts.com to Server-A's name servers and set up mail on Server-A for allparts.com users to use. Basically, I want to dump the virtual hosting I am using for Server-B and do it all on Server-A. I can't eliminate Server-B because the web apps I run there are only Windows based.

I know how to handle changing the nameservers. What I am unsure of is getting the email configured so users can send and receive email since the web server is not located on Server-A and the allparts.com users don't have accounts on Server-A.

Hopefully, all of this makes sense...
Can someone sketch out what I need to do?
Thanks!

[wpwood3]

After reading and re-reading several of the email related How-to's here it seems like I can take one of these three paths:

1) Use Eliufoo Mahinda's How To Configure ISP Mail Server With Virtual Users/Domains On Centos 5.0 Using Postfix, Dovecot, MySQL, phpMyAdmin, TLS/SSL

2) Use Falco's Virtual Users And Domains With Postfix, Courier And MySQL (CentOS 5.1)

3) Or Joe Topjian's Virtual Hosting with Postfix


I'm not sure which is the better path. Unfortunately, Falco's How-to uses Courier and I have Dovecot.

Why isn't there a How-to for those of us that have the "Perfect Server" configuration? I don't want to risk breaking my ISPConfig 2 setup while I'm trying to add a feature that will be included in ISPConfig 3. This is frustrating.

[wpwood3]

Maybe I'm making this too complex by going the virtual user route.
I only have a handful of users to worry about. The easier way may be to just add real users to Server-A and set up email accounts there for them.
dns on Server-A would look like this:
allparts.com and www.allparts.com would have A-records that point to the IP for Server-B
mail.allparts.com would be added as an A-record and MX record on Server-A for mail

If I do that I would still have the full functionality of ISPConfig.
I don't know how this setup would handle users that need to send and receive emails on both domains. ie- joe@allparts.com and joe@myshop.com

I like the potential simplicity but, I'm still not sure how to do all of this properly.

Comments?

[falko]

You cannot use virtual users together with ISPConfig!

I'd simply create a web site for allparts.com in ISPConfig and create your email users with ISPConfig. You don't need to use the allparts.com web site on server A (the DNS records are pointing to server B).

[wpwood3]

Thanks Falko.

Could I create a co-domain instead? (and point the A-record to server B)
That way each current user on myshop.com would also receive email sent to allparts.com.
So email sent to joe@allparts.com would come to joe@myshop.com. Correct? Otherwise, I can't have 2 users on Server-A with the username of "joe".

Also, how do I setup Postfix on Server-A so applications on Server-B can send mail? Can I simply add the IP of Server-B to the mynetworks variable in main.cf or is there more involved?

[falko]

Originally Posted by wpwood3

Thanks Falko.

Could I create a co-domain instead?

Yes, you can do that.

Originally Posted by wpwood3

Otherwise, I can't have 2 users on Server-A with the username of "joe".

Usually you create the email addresses as aliases, for example joe@domaina.com would go to web1_joe, and joe@domain2.com would go to web2_joe...

Originally Posted by wpwood3

Also, how do I setup Postfix on Server-A so applications on Server-B can send mail? Can I simply add the IP of Server-B to the mynetworks variable in main.cf or is there more involved?

Take a look here: http://www.howtoforge.com/postfix_re...her_mailserver

[wpwood3]

I think you misunderstood what I want to do with the email...

Server-A has Postfix on it
Server-B has applications on it that need to be able to send mail but there is no mailserver on Server-B.

I want Server-B to be able to use my mail server on Server-A.

How do I configure Postfix on Server-A to accept and send email that comes from applications on Server-B?

I know I can simply create a valid mail account on Server-A and use smtp to send mail from Server-B to A. Is that the best way?

[falko]

You must either program your apps to use SMTP-AUTH (i.e., you create a user account with a password for them on server A), or you add server B's IP address to mynetworks on server A.