[Inbound Email] Recover stop polling

[Hooghof]

Describe the bug
WCG reports the spontaneous stopping of the polling of the inbound email component on several 4.17.9 instances.

To Reproduce
It is not possible to reproduce.

These are parts of the assimbly-production logs of boland around the last successful poll.

boland_error.log
boland.log

https://dovetailworld.atlassian.net/browse/FG-2498