I think a lot is hidden inside "which calls SES" versus "point it at your MTA, do a ton of configuration, then it may work." Email is unfortunately a moving ta

I think a lot is hidden inside "which calls SES" versus "point it at your MTA, do a ton of configuration, then it may work." Email is unfortunately a moving target. What worked before, gradually stops working as the big providers put up increasing obstacles to your own MTA doing a successful delivery. I've heard Amazon SES also has delivery problems so take with a pinch of salt. But I would hope they generally try to maintain it.