Hi everyone. We've been using postfix + AuthSMTP for quite awhile for our outgoing email notifications. AuthSMTP is getting kind of expensive, so I'm trying to switch to Amazon's Simple Email Service. I've successfully configured postfix to send through SES and it works great, but Amazon throttles you heavily until you've proven yourself as a good email citizen, so we can't just flip the switch to it.
What I'd like to achieve is having amazon-ses as the default transport, and when it starts getting failures, falling back to the authsmtp transport for some time before attempting aws-email again. This would let us send as much as possible through amazon, hopefully getting our quota raised quickly. (We have an aws-email transport set up that sends through a perl script that returns an error on quota overages.) I've scoured the postfix config docs for a couple hours, but nothing stands out to me as able to do this. The closest thing I can find are the *_destination_concurrency_* options, but those appear to be specific to destinations, not the transports themselves. Is there some way to accomplish this in postfix? -- Zach Wily
