Suddenly can't receive incoming emails - Mac Exchange
Updated to Yosemite a few weeks ago and everything has been running fine.
Friday afternoon stopped being able to send emails (receiving no problem)
Checked SMTP settings on all computers set to the exact same thing, all having same problem.
Currently set up with
Connection doctor states SMTP "Connection to server succeeded; login not required" (green light)
However get this error message
"Cannot send message using the server smtp..w14a.comcast.net -
The sender address was rejected by the server smtp.w14a.comcast.net.
The server response was: An error occurred while sending this message using the SMTP server “(null)”
What gives ?
How can I fix this so that everything is back to normal.