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I get an error message saying too many recipients when there is only 1 recipient

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I tried to send and email to multiple recipients and got this message but it changed the email address each time.

An error occurred while sending mail. The mail server responded: 4.1.1 626rb7nvIwhW1 Too Many Recipients (TT501).

Please check the message recipient "fish222@btinternet.com" and try again.

I now get the same message when I send an email to a single recipient. The email address is correct. How do I fix this?

I tried to send and email to multiple recipients and got this message but it changed the email address each time. An error occurred while sending mail. The mail server responded: 4.1.1 626rb7nvIwhW1 Too Many Recipients (TT501). Please check the message recipient "fish222@btinternet.com" and try again. I now get the same message when I send an email to a single recipient. The email address is correct. How do I fix this?

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some mail providers issue this error if you are not logged into their mail system when you try to send mail.

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