I hope this email finds you well. Unfortunately, we regret to inform you that the "Mail Recall" feature is currently unavailable.

The Mail Recall service allows users to retract or recall an email message that has already been sent, enabling them to rectify any errors or make necessary modifications. However, due to technical constraints and system upgrades, we are currently unable to offer this functionality. we will add this feature in our future roadmap.

For the work around we recomend you to send a manual recall email, as o365 mail recall does similar for remote mails. 

Below is the sample recall email

Recall: Subject of mail

If you have any questions or concerns, please feel free to contact us. We value your business and remain committed to providing you with reliable and efficient email services.

Best regards,