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https://support.google.com/mail/thread/23403088?hl=en
Hi! I have recently subscribed to a Debian mailing list. And 4% email being bounced back they had to circumvent their system for me especially which is kind of embarrassing because I didn't want to …
https://serverfault.com/questions/303966/smtp-error-goes-directly-to-badmail-directory-after-queue
The secret to SMTP is to check the logs. If this is the only situation of your mails failing, then you'll have to look to see if the mails are formatted correctly and if they're failing enmasse or just a portion.
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