After using Yahoo Mail IMAP for years on my iPhone, I was excited when I read a Wikipedia article stating that one can use IMAP on Apple Mail for the desktop also. I followed the instructions listed here:

EarlyRed: Yahoo IMAP settings for Mac and Apple Mail that actually work

These are the settings:
Incoming Server -
Outgoing Server -
Incoming Port - 993 (requires SSL)
Outgoing Port - 465 (requires SSL/TLS)
Username: full email address (for example, or
Password: the password you login to Yahoo! with.

But I'm not able to send out emails. I double checked my Outgoing server and Outgoing Port settings, and I also tried the Connection Doctor and the light goes green stating "Connection and login to server succeeded". I'm not sure what is wrong. Any advice would be most appreciated!