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1

The invalid sender address in the messages suggests that you have not set up your CiviMail -> Mail Accounts bounce account with a proper domain - that sender would normally have that domain after the @ sign.


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If the same credentials work on one server and not another, there's a good chance that you have php-mcrypt installed on one and not the other. When php-mcrypt is installed, CiviCRM encrypts the SMTP password, and assumes that any passwords are encrypted. This can be a problem if your PHP environment changed (in particular, php-mcrypt is deprecated and it's ...


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I'm working with a site that has used MailJet via SMTP for a number of years. I'm not aware of any issues of using it in that way.


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