Rejected Emails

Hi Ness2002 

Thanks for your post and Welcome to the Community Forum.

Generally speaking, a Rejected Diagnostic error means that the recipient's end has rejected the incoming email.  To check on this, I would recommend Email an invoice to yourself. This will let you confirm the email address that the email is being sent from. Once you know this, provide it to the recipient so they can ensure it's whitelisted against any antispam systems they have set up on their email as well as add it to their address book within their email. 

By having the email whitelisted and contained in the address book, it should help prevent the email from being marked as spam incorrectly. 

Please let me know how you go. Let me know if you require any further assistance with this. I'm happy to assist you.

If my response has answered your inquiry please click "Accept as Solution" to assist other users find this information.

Best Regards, 

Cel