Send e-mails with Yahoo
To send e-mails with Yahoo mail, you have to use this configuration:
SMTP server: smtp.mail.yahoo.com
Connection: Full SSL
[x] Perform SMTP Authentication
your email / App-Password
POP3 is not required
In WebSite-Watcher, you have to enter an App Password, not your Yahoo account password. You can find app passwords in your Yahoo account under "Account Info" and "Account Security".