Error Code 550 on SBCGlobal.net Account
I am getting this error on all e-mails sending through Outlook on the SBC Account. I can receive messages, but cannot send. I have checked pop and smtp settings and they are correct.
Your message did not reach some or all of the intended recipients.
Subject: Test 4
Sent: 7/13/2019 8:15 PM
The following recipient(s) cannot be reached:
email account on 7/13/2019 8:15 PM
550 Request failed; Mailbox unavailable