Allow multiple bugs to track a single email

[kajames-msft]

The project I am working on involves hundreds of work items and email threads, and there are multiple work items per email thread. It would be super helpful if the following syntax worked:

@mail2bugmention
!!!Bug #xxxxxxx0
!!!Bug #xxxxxxx1
!!!Bug #xxxxxxx2
!!!Bug #xxxxxxx3
!!!Bug #xxxxxxx4

And all of the bugs could track the same email thread. Currently, when I try the above syntax, only the first bug I mention will track the email thread.

Thanks so much!