iOS by default saves sent messages only to the phone, rather than on the server. This can result with your sent emails not showing up in other applications. These instructions will help you correct this.
Launch the Settings app
Choose Mail Contacts and Calendars.
Select the account with which you are having trouble syncing the Sent folder.
Under IMAP tap on your Account.
Choose Advanced at the bottom.
Under Mailbox Behaviours, tap on “Sent Mailbox”.
Ensure that the folder called “Sent” is checked off under the “On the Server” section.
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