Can't send emails with any regularity. Seriously aggravating.
Have a new iMac (macOSCatalina version 10.15.6). Sending emails became erratic early on. Changed password, checked server setting repeatedly, spent hours on phone with Apple support and Earthlink.
Occasionally (and it seems to e in the evenings) outgoing email will work......until it doesn't. Connection doctor says all is good. I am now getting this message: " Cannot send message using the server Earthlink"
"Verify that you have addressed this message correctly. Check your SMTP server settings in Mail preferences and verify any advanced settings with your system administrator
The server response was: Please configure your mail client to use authentication.
Select a different outgoing mail server from the list below or click Try Later to leave the message in your Outbox until it can be sent. " Any ideas? Thank you!
iMac 21.5″, OS X 10.11