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From: Victor Duchovni (Victor.Duchovnimorganstanley.com)
Date: Mon Nov 09 2009 - 11:24:26 CST
On Sun, Nov 08, 2009 at 04:30:30PM -0500, Mike Gering wrote:
> I've built my webserver on Amazon EC2 which, even with static IP addresses,
> does not handle reverse DNS lookup, causing (relatively few) recipient
> servers reject the mail. We've contracted with a mail relay service, but
> they are more expensive than the EC2 service itself! Since we're a
> municipal government, we need to reduce expenses as much as possible. The
> only solution I can think of is to have postfix attempt to deliver outgoing
> mail directly, and then for failures due to connection refusals, deliver
> them via the relay.
Sorry EC2 is a compute-farm not an email hosting service. IIRC, Amazon
have contributed the EC2 address space to the SpamHaus PBL, as they take
no responsibility for any email sent from that address space, spammers
can hire as many CPUs as they want, and try to send mail from EC2 if they
Since most of the world uses zen.spamhaus.org, naturally neither you
nor the spammers will have much luck with sending email directly from
It is hard to see how you save money on EC2 vs renting a dedicated Colo
node. EC2 is about scalability for variable loads, and the ability to rent
lots of CPU for a short-term compute project. If you need modest CPU +
bandwidth on an ongoing basis, you should be able to find something
reasonably competitive with EC2.
Instead of buying SMTP relay service. Rent a box, and deploy a relay
on it. Choose a reputable hosting provider, that does not tolerate
spammers, you don't want to be collateral damage when the hosting
provider's entire network is blocked.
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