I usually get pissed about being auto-added to marketing newsletters, but I somehow wound up on one for a Kenyan airline and I don't even mind.
They only send messages to announce route changes, the messages are polite as hell, get straight to the point, contain both HTML and plaintext versions, and have no remote content.
I didn't make it to Lamu when I was last in Kenya but it's nice to know I can fly there from Mombasa now.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko