Complete IOS newbie here. I just finished a Windows outlook add-in that once someone hits send checks the subject line for a '[any character]' so bracket project name bracket. If is is missing the outlook add-in prompts for a project and inserts that into the subject line.
Not sure that I understand. You cannot do anything when the user sends an email from the mail app. You can programmatically send an email with iNet library or with: Mails and SMS messages