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Hi @spartanvape
I’ve never used the SMTP, since I felt it was slow and I didn’t have enough logging. I would recommend that you use the SMTP Relay, which is also what Google recommends: https://support.google.com/a/answer/176600?hl=en
My setups with Magento has always been with a local Postfix server, which handles the queue and sends via the relay. That way, it will retry sending if it lost connection and I have a log of everything going out.
Hello, all
You can make sure that your mailing list is fully opted-in and that you’re using SMTP authentication.
Also to test the mail score of your emails you can use a website like:
and then send a valid test - an exact email with a valid - subject, message body, full signatures and attachments.
Regards, Alex