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Admin Email Notification Sending Failed - PHPMailer Exception - SMTP Error: Could not connect to SMTP host. (Subject: WHMCS Domain Synchronisation Cron Report)

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Hello @ptomter

What are you using for email PHP Mail or SMTP?  Who is your email provider if SMTP and what settings are you using?

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I use SMTP, and Microsoft 365 solution. I downgraded / put a earlier backup in place and now everything works again so I have to figure out this later when planning to upgrade to latest WHM version.

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When I switched to SMTP and enabled SSL/TLS I had to make sure the SMTP Host and the common name in the SSL certificate matched. When it did not match, I had errors. Perhaps test SMTP without SSL/TLS on. If that works, then you were experiencing the same problem as I had.

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can anybody give a hand

As i have the same issue but it happens randomly . on the other hand, ssl/tls protocols are already disabled on both relay machine and WHMCS. 

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