Swansea's promotion last season prompted him to pen them a letter of congratulations.
Quizzed on his motives, Dalglish responded: "It's just something I've always done in management. I thought everybody did it. When I first came into the job there were letters exchanged but now it's emails and texts. We're a wee bit old fashioned!
"It's nice to recognise people's success in the game and I think you'll find it (letters) went to a few places."