E-Mail scaling question
cswiger at mac.com
Tue Dec 21 20:19:57 UTC 2010
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
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.
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