I have a Mac, running Catalina, and an iPad mini 4 running 13. To remove a blocked sender see Block or allow (junk email settings). Follow these steps to resolve the issue: Check if your sending IP is on any spam lists, search for “spam database lookup”.You need to provide proper settings for it to work. 'Sender address was rejected by the server. Thus mail server identifies it as trusted and accepts the mail. The message was blocked for sender email address.Here, we need to change the sender domain in the web form to a valid website on the server.They can suggest other troubleshooting steps to follow. Select the email again at the top of the page. You can receive mail, but can’t send mail You see the error: Cannot send message using the server The sender address was rejected by the server: There’s a problem with your outgoing server or port settings. The sender address was rejected by the server on mac Cannot Send Email From Iphone Server Rejected.
