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Hi, the error message that you get form SMTP server happens usually with improper SSL authentication from client. So, do you send your 800k mails from one or multiple mail clients? Do they all authenticate the exact ame way if you use multiple?
To debug, you may want to try via CLI using https://docs.aws.amazon.com/ses/latest/dg/send-email-smtp-client-command-line.html
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Just for info, i tried with the CLI and i got the exact same problem, so the problem seems not to be with the client used.
answered 10 months ago
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Hi, thanks for your answer. The mail are sent by the same client ( it is a .net Application that sends notification mails ), so the authentication is the same. Another strange thing is that not all the mails fail. About 20% fails, the others simply works as before.. i can't understand why some connection get accepted and some don't. The connections are made from the same ip / device / client. Even debugging the application give no more clue, the problem seems to be in the authentication but no more info are given. Now i'll try to use the CLI to see if i can get more info.