Fortunately, there are two easy ways to do that on the i Phone and i Pad in the Mail app in i OS 7. The built-in Unread mailbox One approach is to use the i Phone's built-in Unread mail folder, a new feature in i OS 7.
To access it, tap the word Mailboxes at the top left of any screen showing a list of emails.
While you are there, you can also choose to display or hide other built-in mailboxes, such as a mailbox with all Flagged messages, a mailbox with all messages that have Attachments, etc.
Another workaround allows deleting all emails in i OS 10 as well, but it should be stressed this is indeed a workaround and it is nonspecific in that literally every single email will be deleted from the i Phone or i Pad in the process.By the way, it’s not just “Trash All” that is missing in i OS 10 Mail, it’s also any ability to bulk select all emails in general.For now the workaround involves a lot of tapping and manually selecting emails and then trashing them, it’s a bit cumbersome but it gets the job done on i Phone and i Pad.This is unfortunate because the ability to delete all email in i OS is easily one of the more useful features to managing a busy email inbox.The lack of a “Delete All” button in Mail for i OS 10.0, i OS 10.0.1, and i OS 10.0.2 could just be a bug or mishap, but in the meantime if you’re looking to regain that trash all functionality we’ll show you a workaround that accomplishes a similar “Delete All” mail ability.Quite a bit more hands on than before, but it works the same.Losing a feature is rather unusual with an i OS software update, which suggests the removal of Trash All in Mail may be inadvertent.Once your email account is set up using IMAP settings: Apple, Apple TV, App Store, Apple Watch, Beats, Face Time, i Cloud, i Message, i Phone, i Pad, i Pod touch, i Tunes, Mac Mail, Mac OS X, and Safari are trademarks of Apple Inc., registered in the U. I often leave an email marked unread so that I remember to deal with it at a later time.If you have already set up your account on your i Pad using the normal, automated process (not the process mentioned above), you'll have to delete your account and add it back again to change from POP to IMAP.See Fixing email problems on i Phone and i Pad for instructions. i OS Mail lets you choose how much mail to synchronize for Exchange accounts. If you are wondering where all your old emails have gone, it may be the default of synchronizing a mere week back that has been hiding them. For Exchange accounts (including Google Apps Mail and Outlook Mail on the Web), i OS Mail can automatically download only the most recent messages, mail up to a month old, or all mail.So it’s no surprise that email geeks have monitored upcoming changes to i OS 10 since the early days of its beta test phase.