Issue to send emails to one recipient

STokyo 0 Reputation points
2023-09-06T01:31:46.4533333+00:00

Hello,

I am trying to send emails to specific recipients but it does not work.

Sometimes, this error message is received:

550 5.4.1 Recipient address rejected: Access denied. AS(201806281)

Note:
I do not think it is only due to Outlook, since I tried with gmail, and other email address too, with different devices, on different networks (4G, house Wifi) and it does not work (with or without attached files).
On all the messages sent, only one or two have been received, so it looks like it is not blocked all the time.

Could you please share potential reasons for this issue, is it an email setting issue?

Thank you!

Outlook
Outlook
A family of Microsoft email and calendar products.
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