can't trash emails
Screen says, "unable to move"; can't delete
iPhone 6s
Screen says, "unable to move"; can't delete
iPhone 6s
Are you using more than one device to handle your mail? If yes, depending on the setup of your mail account, one of the other devices prevents that.
Get help if you have issues using a POP email account with more than one device - Apple Support
Set up an email account on your iPhone, iPad, or iPod touch - Apple Support
can't trash emails