When you network with someone, or someone from your social circle assists you, it becomes necessary to express your appreciation and tell the benefactor(s) that you really enjoyed working with them and found their support very helpful. The best way to let your benefactor know that you acknowledge his/her support is by writing a follow up email.
Use opening salutation. Since you are familiar with the person the mail is being written to, use his/her name in the salutation. Use Dear (name), however, if you do not know the name of the recipient, you can write Dear Sir as well.
The first paragraph of the follow-up email should state why you are writing this email and how you are satisfied with the support the recipient(s) gave you through networking. Do not write the details in the opening paragraph as it may turn off the reader.
The second paragraph should concentrate on the details of the event and highlight the help the recipient gave you – a seminar, a service, etc.
In the third paragraph, you can express hope for even better relationships in the future. Express your gratitude once again and assure the recipient of your well wishes.
Use closing salutation. If you have used Dear (name) in the opening salutation, use “sincerely” at the end.