How she met your grandfather

My grandmother told me how she ended up marrying Grandpa.
She was in her 20s, and the man she was dating left for war.
"We were in love," she recalled, "and wrote to each other
every week. It was during that time that I discovered how
wonderful your grandfather was."

"Did you marry Grandpa when he came home from the war?" I
asked.

"Oh, I didn't marry the man who wrote the letters. Your
grandfather was the mailman."