I have a web application that sends significant volumes of emails, using SMTP. The SMTP server is Office365.com and this is storing copies of sent emails in the SENT folder when viewed in Outlook.office365.com
I can periodically using the web interface to delete out sent emails older than 3, 6 or 12 months (or all) but this will always risk the total mailbox size exceeding limits (as happened today). Outlook "rules" don't apply to the sent folder, and only built-in retention policies can be applied to that folder; so I can't setup a "delete after 1 day" policy and apply it.
Is there any way I can configure things, either via the web interface OR via the SMTP send itself, to prevent messages sent by SMTP being saved in the SENT folder?
What I have tried:
* Set up a custom retention policy, but these can't be applied to the SENT folder.
* Searched all other user settings in the web interface.
* Googled for answers but nobody seems to know a method to do this.