Hosted SMTP / SMTP Relay Service

A few hosted SMTP (or SMTP Relay Service) providers (their servers are whitelisted, they manage bounces and can send out large volumes of email without attracting the attention of spam blacklisters or ISPs):

SendGrid
Postmark
CritSend
SocketLabs
Amazon SNS : It seems like SNS can be used for this and would be a cheaper option than the rest, but no personal experience with it.

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