multiple virtual domains?

[bhwong]

Yes, if everyone has standard setup, then the default installation should works for everyone without the need for customization. What I'm suggesting is not spoon feeding, but rather, a proper and complete checklists we should perform in order to complete the setup. It can be very general with examples given etc, but it has to be complete so that we don't miss out a thing that cause sending or receiving emails to get rejected etc.

[unclecameron]

Good question about the multiple domains, I have a few traditional postfix/virtual domain boxes and you can only do a single PTR per IP. All my boxes deliver fine.

PTR and reverse DNS are the same things, one's just more geeky

SPF, domain key, feedback loop, and abuse@... are all efforts you may (or may not) choose to implement as further verification you're not a spammer, usually used by the big guys (AOL, hotmail, etc), I just waited to see if I had delivery problems, then added those when I got the time, or when you get an e-mail from AOL, hotmail or whomever asking about it. I know this is not the 100% eletist super-geeky purist way to do it, but it works and will get you up and running, and in your spare time you can read about them in great depth while you're in your mom's basement awaiting a call from a supermodel Don't get me wrong, they're good to do, but if you need to get up quickly, you should be fine, do the rest when you get home from a REAL date. At that point, look at the postfix user list archives on neohapsis, there's some really good reading there that will help you sort out the other stuff.

[Mistoffeles]

Quite.

You might have mail.freecheese.com, mail.tonsilhockey.com and mail.kermodebear.com, but if they are all on one server with one IP, your mail is all going to come out from one of those (or a 4th "placeholder" like mail.corp.com) despite being sent "from"x@freecheese.com, y@tonsilhockey.com or z@kermodebear.com by the user.

[ArcaneMagus]

When I was running ~20 domains on a Zimbra server I had every domain setup with mail.company.com as it's MX record and the PTR record said xxx.xxx.xxx.xxx IP address was mail.company.com

So as an example:
The MX record for freecheese.com was "0 mail.company.com"
mail.freecheese.com was a valid dns entry that pointed to the IP address of the Zimbra server, and mail.freecheese.com was also setup as a virtual host in Zimbra, so users of that domain would have no idea they were actually using mail.company.com unless they looked at the MX record for their domain. The PTR record of the IP address pointed to mail.company.com.

[Mistoffeles]

How does that work with the web interface, is it still transparent to the user?

[ArcaneMagus]

As long as they access the Zimbra server via the virtual host address it is completely transparent to the user. They will log into "their" own mail server at mail.freecheese.com, and they can enter in user names as just user1 rather then user1@freecheese.com since zimbra knows that if somebody is accessing it via that virtual domain then it should assume the user is in that domain.