We'll be deploying a mail server on a Rackspace cloud server, and they 
suggested that because their offering is 'utility computing' the IP addresses 
included are dirty (in a blacklist kind of way) and we should use a commercial 
ESP such as SendGrid, PostMark, CritSend, CloudSMTP, or the like.

Has anybody done research in this field? Any favorites?

We'll just be forwarding our outgoing SMTP traffic to their service for its 
quality of deliverability. I doubt we'll use any of reporting features, or even 
SPF/DKIM.

Quinn

-- 
Strangecode, LLC
http://www.strangecode.com/
+1 530 636 2633

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