Kelly:
Absolutely fine for mail.example.com (DNS and PTR agree) to serve as
mail server for multiple domains.
Only real issues arise when you want to use SSL -- either pay out the
nose for a generic cert, or have all domains connect to your
mail.example.com server and buy just the one certificate (the latter is
what I do).
Whatever you decide to put into /var/qmail/control/me, just make sure
its valid.
- say you put "mailhost.example22.com" in there
- First, make sure that mailhost.example22.com resolves to that host's
IP address (either directly or via NAT) [ for example: 10.10.10.10 ]
- Second, contact your ISP and make sure the PTR record for your IP [
10.10.10.10 ] resolves to mailhost.example22.com
When you think you're done, check out intodns.com and mxtoolbox.com --
both sites can help you resolve DNS issues that may affect your server.
Finally: IMPORTANT! Your QMT server does not have to be a DNS server too
-- but is SHOULD resolve (recurse) queries itself. Not only do you gain
efficiency for local resolution, but you also gain the presence of
locally cached entries that will make your QMT much more efficient!
Good Luck!
Dan
PS: I host a mailserver (one of 5 these days) with over 200 domains! So,
yes this works and is perfectly normal!
On 4/25/2014 5:29 PM, Kelly Cobean wrote:
Hi all,
I run mail for 5 or 6 domains on my server. I have a few questions
regarding multi-domain hosting
1. What is the appropriate entry for the /var/qmail/control/me file
which I believe controls how qmail identifies itself for SMTP HELO/EHLO.
2. What should the PTR record for my IP indicate? Should it match the
hostname listed in /var/qmail/control/me?
3. Is it "normal" for a server that identifies itself as
mail.example.com to send mail for, say "fr...@test.com".
In other words, Is this an appropriate conversation?
220 READY
EHLO mail.example.com
OK
MAIL FROM: fr...@test.com
OK
RECEIPT TO: b...@sample.net
....
Is the mail server for sample.net going to care that a server which
identifies itself as being mail.example.com is sending mail for
fr...@test.com? I would imagine this is very common, but is this also
not what spam often looks like?
Thanks.
Kelly
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