Why won't my emails delete off of my phone when I delete them off of the computer.

You are Welcome.

When Trying this... verify your mail configurations.

Go Here: IMAP server settings for Yahoo Mail - Yahoo Support

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Alohaginger Said:

"Emails: Why won't my emails delete off of my phone when I delete them off of the computer. I use yahoo."

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Did this start right after the iOS 13 update?

If so, or even if not, remove your Yahoo account from Mail. Add the Yahoo account back in to Mail.

You are welcome!