Mail Flow Rule - Send reminder notifications for email approvers

[VigneshGanesan]

Hi There,

   We have a requirement from the business where every email sent to an external domain with attachments should be approved by a list of approvers. We configured a mail flow rule for this and its working as expected. However, if the approver fails to respond within one day a reminder notification should be sent to the approvers and I'd like to know how this can be achieved. The current exchange online default setting doesn't do that because the job that runs on the tenant level runs once in every 7 days and hence it takes anywhere bewteen 2 to 7 days to send the reminder notification as a result of which the reminder notification is not sent to the approvers after one day. How, can we get around this issue? 

Here's the link to official documentation from Microsoft and this is what it says,

1. If any of the approval requests aren't approved within the expiration time (two days for Exchange Online), the sender receives an expiration message.

2. The processing of expired moderated messages runs every seven days. This means that a moderated message can expire at any time between two and nine days.

https://learn.microsoft.com/en-us/exchange/security-and-compliance/mail-flow-rules/common-message-ap...

[#2]

I'm not aware of any way to configure alerting on messages waiting for moderation. Perhaps you can try an approach that combines transport and inbox rules - "tag" the message in some way when marking it for moderation, for example prepend the subject with some string. Then, use Outlook inbox rule to automatically flag any message containing said string in the subject for follow up ("flag messages for follow up at this time" action).