Check POP access settings for Yahoo Mail.

What are Yahoo Server Settings?
POP (Post Office Protocol) is one way to get Yahoo Mail in a desktop or mobile app. POP downloads copies of your email, so you can move and delete them in the app without affecting the original emails.

POP settings for Yahoo Mail
Incoming Mail (POP) Server

Server - pop.mail.yahoo.com
Port - 995
Requires SSL - Yes
Outgoing Mail (SMTP) Server

Check Details Information
https://www.yahoophonenumber.n....et/blog/yahoo-server

Yahoo Server Settings - POP & IMAP » Round The Clock Global Services
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Yahoo Server Settings - POP & IMAP » Round The Clock Global Services

With correct Yahoo Server Settings - POP & IMAP you can fix a broad range of Yahoo email errors and enjoy the fast services with ease of mind