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"Alert. An error occured while sending mail. 5.1.1 recipient rejected. Please check the message recipient & try again. This happens every time now.

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I don't seem to be able to send out ANY emails now. It started with me trying to send a message and I would get the error (that I will send you & include in this query) once and then try sending again and it worked. Then, it deteriorated and after 3 consecutive attempts to send out an email it would successfully be sent. Now, it seems that every time I try to send an email out, I get the same old error and it won't send no matter how many attempts I try. Here is the full version of the error message:

Alert, An error occurred while sending mail. The mail server responded: 5.1.1 <davidlcristofoli@icloud.com> recipient rejected. Please check the message recipient "davidlcristofoli@icloud.com" and try again.

I am currently running version 55.0b2 (64-bit) on a Mac Book Pro.

Any help would be greatly appreciated. Thank-you for your valuable time.

Sincerely, David

I don't seem to be able to send out ANY emails now. It started with me trying to send a message and I would get the error (that I will send you & include in this query) once and then try sending again and it worked. Then, it deteriorated and after 3 consecutive attempts to send out an email it would successfully be sent. Now, it seems that every time I try to send an email out, I get the same old error and it won't send no matter how many attempts I try. Here is the full version of the error message: Alert, An error occurred while sending mail. The mail server responded: 5.1.1 <davidlcristofoli@icloud.com> recipient rejected. Please check the message recipient "davidlcristofoli@icloud.com" and try again. I am currently running version 55.0b2 (64-bit) on a Mac Book Pro. Any help would be greatly appreciated. Thank-you for your valuable time. Sincerely, David

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Have you gone to your apple email account and setup the mandatory 2 factor authorization and generated an app specific password?

If not you need to. https://support.apple.com/en-us/HT204915

FYI:Next time just add to your original post and do not start a new one. You are not sending emails you are posting to this forum