I don't use that facility, so have no idea.
But, if I did, and messages going to those external accounts were sparse enough that I couldn't tell if the fetching process had stopped working, I'd send a test message to each of them every few days / week / couple of weeks / month or whatever and then expect to see all those test messages being fetched.
I have a handful of situations where I regularly send messages between different mail providers' webmail systems. In each case if I want to send another I merely find the last one, edit it "as new", and send that. I keep the template messages in separate folders so there's no difficulty finding them, and - lastly - use my day-to-day reminders system to tell me to send such a message as required.
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