For the benefit of anyone who has a similar problem .... I eventually found this on the Yahoo web site
Yahoo Mail
We've recently updated our servers for your safety and now require a secure connection when accessing Yahoo Mail from a mobile device or mail client.
If you're using an unsecured connection, you'll receive a connection-related error. Don't worry, here's how to fix it.
POP server settings
Want to access Yahoo Mail from an email program like Outlook or Mac Mail? Here's the settings you'll need.
Incoming Mail (POP) Server - Requires SSLSecure Socket Layer
Server: pop.mail.yahoo.com
Port: 995
Requires SSL: Yes
Outgoing Mail (SMTP) Server - Requires TLSTransport Layer Security
Server: smtp.mail.yahoo.com
Port: 465 or 587
Requires SSL: Yes
Requires authentication: Yes
If your POP client doesn't offer TLS, you'll still be able to use SSL.
Login info - Requires authentication
Email address: Your full email address (name@domain.com.)
Password: Your account's password.
In my case I simply had to check the SSL box, which automatically set the incoming port to 995. It also set the outgoing to 25, which I reset to 587. Problem solved.
Would have been nice if Yahoo had warned me of the "update" in advance.
Yahoo Mail
We've recently updated our servers for your safety and now require a secure connection when accessing Yahoo Mail from a mobile device or mail client.
If you're using an unsecured connection, you'll receive a connection-related error. Don't worry, here's how to fix it.
POP server settings
Want to access Yahoo Mail from an email program like Outlook or Mac Mail? Here's the settings you'll need.
Incoming Mail (POP) Server - Requires SSLSecure Socket Layer
Server: pop.mail.yahoo.com
Port: 995
Requires SSL: Yes
Outgoing Mail (SMTP) Server - Requires TLSTransport Layer Security
Server: smtp.mail.yahoo.com
Port: 465 or 587
Requires SSL: Yes
Requires authentication: Yes
If your POP client doesn't offer TLS, you'll still be able to use SSL.
Login info - Requires authentication
Email address: Your full email address (name@domain.com.)
Password: Your account's password.
In my case I simply had to check the SSL box, which automatically set the incoming port to 995. It also set the outgoing to 25, which I reset to 587. Problem solved.
Would have been nice if Yahoo had warned me of the "update" in advance.