Who is this charming man?

Today's post brought a lovely card of thanks for the 'brief catch-up at conference' and for "introducing the me to (x), and for your kind words". 

Whoever sent this letter is very thoughtful and has lovely handwriting. Sadly, although it is signed (using a first name only) I have no idea who it is from. Nor, sadly, can I read the postmark.

The writer refers to "reading my blog" so hopefully he might see this. If so, please email so I know who you are!  It's not often people say I use "kind words" so I might as well make the most of it.