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Email Diagnostic - Unexpected response from SMTP server

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  • [Forum] Email Diagnostic - Unexpected response from SMTP server

    After upgrading from 4.1.8 I am having trouble sending emails via SMTP using the same settings that I used pre-update.

    Email Diagnostics tells me: Warning: 554 Unexpected response from SMTP server when ending transmission in ...../includes/class_mail.php on line 708

    This is a pretty vague error. Does anybody know how I can see this "unexpected response"?

    I'm using Amazon SES, so I don't have access to the SMTP server logs. They need to know the response from the server to help me.
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