Dear Martin,

Congratulations on getting the job at Google.

You really deserve it and I’m sure they will soon realize how lucky they are.

Hope all goes well. I look forward to meeting you for lunch as soon as you have settled in.

With best wishes

Jack

Analysis

Sample 3是一封非正式贺信。与正式贺信相比，结构大致相同。语言更加简洁，还用到了一些比较口语化的句式和表达。