英语书信问候语

Hey there,
Just wanted to drop you a line and say hi! It's been a while, hasn't it? Remember that conference in San Francisco back in 2018? Man, those were the days. How's life treating you?
Wishing you all the best, [Your Name]

Dear [Name],
I hope this letter finds you well.
Greetings from [Your City],
Best regards, [Your Name]