How can I throttle IIS in terms of mails per second? and if that's not the case, since I can't find any parameters for such a feature.
Will SMTP IIS automatically queue and resend mail if the initial attempt to send results in a "454 Throttling failure: Maximum sending rate exceeded" response from the Amazon SES SMTP server?
Update: We performed several test, 2 SMTP servers sending 5K mails each, 300 byte small (small size to boost the send rate) to see how the IIS SMTP server reacts. Both logs indicate 454 throttling errors from Aws Ses (1500 errs in total), however no mails were lost, all 10K mails were received.
This leads us to the maybe preliminary conclusion that IIS SMTP handles the 454 throttling response very well.