Date: Tue, 21 Dec 2010 12:19:55 -0800 From: Chuck Swiger <cswiger@mac.com> To: Mark Moellering <mark@msen.com> Cc: freebsd-questions@freebsd.org Subject: Re: E-Mail scaling question Message-ID: <B1E45148-A54A-4453-8FDB-6FEEE6E8A507@mac.com> In-Reply-To: <201012211439.09158.mark@msen.com> References: <201012211439.09158.mark@msen.com>
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On Dec 21, 2010, at 11:39 AM, Mark Moellering wrote: > My company needs a [new] e-mail solution for a product rollout. Rather than > have a few e-mail domains with lots of addresses, the solution we need is for > a very few (mostly one, very rarely more than 3) accounts on upwards of tens > of thousands of domains. I don't see much value in setting up tens of thousands of what sound like vanity domains, but you'll need postmaster@ working at each of these domains to be even minimally compliant with RFC-822/2822/etc, and most people expect abuse@ to work also. > I can't find any info on scaling sendmail or postfix to this many domains. If > anyone has any info, knowledge, horror stories, etc. It would be greatly > appreciated You'll want to use hash table map type for sendmail's virtusertable or Postfix's virtual table-- see /usr/share/sendmail/cf/README or /usr/local/share/doc/postfix/VIRTUAL_README. > Also, I am assuming that to play nice, we need a dedicated IP per domain, so I > may have to survive setting that up before I even get to the e-mail. If > anyone knows of a legitimate way to set up an e-mail domain on a shared IP and > not have half of the e-mail servers assume we are spammers, let me know. There's nothing unusual about having one IP serve as the MX for many domains. After all, many hosting companies provided a shared email solution. What matters most to spam checking is the mail contents, whether forward and reverse DNS match, whether postmaster@ and abuse@ works, and whether bounces, address verification, etc are handled properly. Regards, -- -Chuck
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