On 1/26/2010 1:52 PM, Dan Lists wrote:
We host email for several domains. Occasionally an account will get
phished and our outbound server will get blacklisted by hotmail and
others. We'd like to separate the outbound email so that one domain
with a phished account doesn't get all outbound email blacklisted.
I'm trying to set up an outbound server with multiple IPs. I'd like
email that arrives on an IP to leave on the same IP. In my master.cf
I put:
<IP 1>:smtp inet n - n - - smtpd
-o myhostname=smtp1.host.dom
<IP 2>:smtp inet n - n - - smtpd
-o myhostname=smtp2.host.dom
Email comes in on the different IPs, and the hostname is set to smtp1
or smtp2 in the Received headers. The email is all going out from the
server's main IP not the separate IPs.
I've tried adding "-o smtp_bind_address=<IP 1>" etc. I've tried
setting up multiple smtp services and adding "-o
default_transport=smtp1". Email is still going out on the server's
main IP.
I thought it would be easy to get email to go in and out on the same
IP, but I cannot get it to work. What am I missing?
As a consequence of postfix's modular design, linking [where
mail comes in] to [where mail goes out] is somewhat tricky.
Postfix 2.7 Snapshot 20100117 introduces new functionality
that makes this easier. From the RELEASE_NOTES:
The FILTER action in access maps or header/body_checks now
supports
sender reputation schemes that dynamically choose the SMTP source
IP address.
This is implemented by specifying FILTER actions with empty
next-hop
destinations in access maps or header/body_checks, and by
configuring
in master.cf one Postfix SMTP client for each SMTP source IP
address,
where each client has its own "-o myhostname" and "-o
smtp_bind_address"
settings.
With earlier postfix versions, you need multiple postfix
instances, not just master.cf gymnastics.
-- Noel Jones
