SJ77 Posted August 24, 2019 Share Posted August 24, 2019 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 🙂 Link to comment Share on other sites More sharing options...
Mark Posted August 25, 2019 Share Posted August 25, 2019 Is there anything unusual about the recipient's email address? It seems to think the address is invalid. Link to comment Share on other sites More sharing options...
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