[Cialug] SMTP Proxy

[Josh More]

I don't know of any free SMTP proxies (as those would be spam sources), but if you pay for "Google Message Security" spam filtering, you get a proxy included.  Then all you'd need to do is setup Postfix to accept email from your range on x.x.x.x and forward it on to the Google proxy.

Of course, you could also set Postfix on x.x.x.x to forward to y.y.y.y and setup a rule on y.y.y.y to accept relayed email from the new x.x.x.x.  (Or you could use Qmail, Exim, Sendmail, etc etc).

Either way, as Zach pointed out, you're going to need something listening on x.x.x.x, whether that's a dual IP of y.y.y.y, a new (virtual) server or a firewall rule.

...

Or you could touch each network device and point it at a DNS name.  :)

-Josh More, CISSP, GIAC-GSLC, GIAC-GCIH, RHCE, NCLP
morej at alliancetechnologies.net
515-245-7701

________________________________________
From: cialug-bounces at cialug.org [cialug-bounces at cialug.org] on behalf of Zachary Kotlarek [zach at kotlarek.com]
Sent: Friday, August 27, 2010 20:10
To: Central Iowa Linux Users Group
Subject: Re: [Cialug] SMTP Proxy

On Aug 27, 2010, at 6:48 PM, Nathan C. Smith wrote:

> Can anyone recommend an SMTP proxy?   This is for my internal network.  I want all email sent to x.x.x.x to go to y.y.y.y because x.x.x.x is being decommissioned and instead of trusting DNS I used IP addresses.  ;-)


If your network configuration would allow it you can always throw the old IP on as a secondary on the new system. Or as a secondary on any other host that supports port forwarding.

        Zach