Why put a period after your name in the closing of a communication/E-mail? [closed]

I have several co-workers in Europe and all of them tend to put a period after their names in the closing of E-mails, e.g.:

Thanks,
Matt.

I've never seen this, so I am curious if it is proper form to put a period after your name in a communication.

Email is not subject to normal punctuation conventions.

It's probably just a personal idiosyncracy, like putting a hyphen before a signature initial.

-j

I'm from Ireland and I see this quite a bit, in letters and email and from different companies & countries — it doesn't matter. The only pattern that I can make out is that it seems to appear a lot with the shortened form of someone's name, e.g. Matt. instead of Matthew, Ed. instead of Edward. I have also noticed it when people use just their first name and not surname e.g. John. I'm still searching for a definitive answer, though.