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A little old fashioned, but you could try a snail mail thank you card. I'm definitely showing my age a bit here, but it's something that I've started doing with my clients.

Regardless, it's definitely never to late to say thank you whether it's via email or some other medium.

In support - do it! It means a lot to be told a genuine thank you.

Yuk! Domains suck in that regard.

He is on LinkedIn and Twitter.