Snail mail is fine:-)

Hey Jessica! Received your letter today, thank you so much! :) Will write back as soon as possible!

Hi, Jessica! Thank you. I'll try to write you a letter in the nearest future. I had a very busy time, but it is better now.
Hope, everything is fine with you and your family!

Happy Birthday Jessica !
Have an awesome day !!
Got your letter a few days ago, will reply soon :)

Happy birthday! All the best for you! I hope that you have a great day! :)

Wow that is cold! It was soo freezing cold here the last 3 weeks but now it's much "warmer" and snow is coming tonight! Happy when it's spring!
Thanks so much for your letter. Got it today! I'll reply soon! :)
Take care of you and your baby! :)

Hi, I am looking forward to get your letter! I love this new profile picture! :)

hi
Hi just saw ur prof.and i wanna b ur pal.so that we can share idears talk about culture too.
Byee.

Hey,

got your letter today! Thank you so much for it! I'll try to write back soon!

Hi Jessica,

sorry that I didn't get in touch with you for some time! Finally the semester is over! I will you write a letter to you now. So you don't need to write first, ok?
Hope that you are doing great!
Greetings from Germany!