Step 1

Launch the Settings app

Step 2

Choose Mail Contacts and Calendars.

Step 3

Select the account with which you are having trouble syncing the Sent folder.

Step 4

Under IMAP tap on your Account.

Step 5

Choose Advanced at the bottom.

Step 6

Under Mailbox Behaviours, tap on “Sent Mailbox”.

Step 7

Ensure that the folder called “Sent” is checked off under the “On the Server” section.