If you are a Yahoo Mail user and you want to make your account as default mail on your device, in that situation, you need to change the settings of your application to use with other software because IMAP/SMTP settings allow your email client to communicate with Yahoo Mail’s servers so you can send, receive, and manage your emails without logging in through a web browser.

Understanding IMAP and SMTP

We should understand about IMAP and SMTP before knowing the setting details.

IMAP (Internet Message Access Protocol)

This (SMTP) is used to receive and sync your email messages when your emails are stored on Yahoo’s servers with IMAP, and any changes you make (such as reading, deleting, or moving emails) are remembered across all devices.

SMTP (Simple Mail Transfer Protocol)

This (SMTP) is used to send emails, and it becomes active when you compose a message and hit “send,” SMTP is the system that pushes your email out from your client to the receiver's server.

Using IMAP is suggested over POP (Post Office Protocol) because it keeps your messages synchronised across devices.

Yahoo Mail IMAP Settings

If you are going to set your Yahoo Mail for getting emails from international clients, you should use these IMAP settings

For Incoming Mail (IMAP) Server- imap.mail.yahoo.com

Use Port Number- 993

Requires SSL- Yes

Username- In the place of user name, you need to mention your full Yahoo Mail email address is required here; you should mention that.

Password- Your Yahoo Mail account password or app password (if you have two-step verification enabled.

Yahoo Mail SMTP Settings

If you are using Yahoo Mail to send emails, you should maintain these SMTP settings to send emails using Yahoo Mail

smtp.mail.yahoo.com is the Outgoing Mail (SMTP) server used to send emails.

Port numbers are- 465 or 587

Requires SSL: Yes

Requires TLS: Yes (if available)

Requires Authentication: Yes

Username: Your full Yahoo Mail email address

Password: You must enter the password for your Yahoo Mail account or app here.

When You Need an App Password

If you are trying to sign in to your Yahoo email on a new device, and your account is enabled for two-step verification, you will not be able to sign in because Yahoo takes account security seriously, so you will need to generate an app password.

Here’s how you can do it:

Go to your Yahoo account security page.

Select Generate app password.

You should choose an application as per your preference from the list 

Outlook

iOS Mail 

Thunderbird, etc

You should make a new password and use it in place of your usual Yahoo Mail password in the IMAP/SMTP settings.

Some Common Issues and Troubleshooting

Sometimes you may face some issues, even with the correct settings, you might face issues.

Check the internet connection because A weak or unstable network can cause failed sync or sending errors.

You should make enable SSL/TLS, which will make sure that encryption is enabled in your client settings for both incoming and outgoing servers.

Use the correct port numbers and Double-check about that IMAP is set to 993 and SMTP is set to 465 or 587.

You should re-enter your login details if the login fails(or app password).

Update your client because sometimes outdated versions of Outlook, Thunderbird, or mobile apps which may not support modern security protocols.