New answers tagged gmail
It can be done - see the postfix documentation for a description of how and where the various types of filters are used. In this case, though, I'd suggest that catching the invalid subscriptions would be better done at the registration point, e.g. by using a CAPTCHA of some sort for any account matching "three dots before @google.com".
if the aws firewall wrapper is denying tcp/587 to the world, it can be opened using the ec2 api tools: ec2-authorize [sec-group-id] -P tcp -p 587 -s 0.0.0.0/0 although it sounds like you have already opened this. to verify, run ec2-describe-group [sec-group-id] regarding icmp not responding, you can open that up by: ec2-authorize ...
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