Yahoo

Link or unlink other email accounts

Tap the Profile icon.
Tap Add another mailbox.
Tap an email provider.
Click Allow at the bottom if prompted to confirm.
Enter your email address and password, if prompted.
Follow the on-screen prompts to allow access to the account.
https://help.yahoo.com/kb/mail-app-for-android/add-remove-email-accounts-yahoo-mail-sln26459.html

SMTP - Outgoing Mail Server
Address	mail.remwebsolutions.com
Port	587
Server requires authentication	Yes
Login/Password	same as incoming server**
Encryption	StartTLS
POP3 - Incoming Mail Server
Address	mail.remwebsolutions.com
Port	995
Leave on mail server	No
Encryption	StartTLS
IMAP - Incoming Mail Server
Address	mail.remwebsolutions.com
Port	143
Encryption	StartTLS