Not a biggie, but a suggestion:
Would it be possible to have this field truncated at the start, rather than the end.
For example I see:
g-6203474712-6210-601533822-1478174426977@bounce.i...
on the web page, which doesn't mean much to me, so I have to click on the message to see the full from header:
g-6203474712-6210-601533822-1478174426977@bounce.info.tfl.gov.uk
so I can see that this is a legitimate email.
If it was truncated at the start I'd see ...6977@bounce.info.tfl.gov.uk and know i was probably ok.
Thanks,
@Matt