Email sending block

One of the user in or domain can not send email, the email address is being block , the following is the error code550 5.7.1 Access denied to edu.umch.de. Cancelled by Alpha (75fd3eb6-d383-4033-98ae-2e080012988d,1d1dbc16-4125-4f55-84c1-f18d65fc6f0d)

A post was split to a new topic: Having trouble sending email

Cloudflare does not provide an email sending service. You will need to consult with your email service provider.

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