When I am connected my Apple Watch it’s showed wrong emails and password
My watch connected with wrong emails
Did you already check the settings for Mail in the WatchApp on your iPhone, is it set to "Mirror my iPhone" ?
Which Apple Watch do you use?
Are you getting the error message, trying to receive email from your 3rd party Mail account, or are you using your iCloud Mail account?
You can also choose which Mail accounts show up on your watch: