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4C143/1 501 Invalid RCPT TO address provided ???

SJ77
SJ77
in General Questions

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some emails aren't sending to some recipients due to 

4C143/1 501 Invalid RCPT TO address provided

Anybody know what this means? How to fix?

Thank you 🙂

Is there anything unusual about the recipient's email address? It seems to think the address is invalid.

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