Email addresses in Contacts (Apple mail)

On the mail of my Macbook I use 3 emailadresses (2 of gmail and 1 of my provider) and 2 adresses with nicknames of my provider. Have I to put them in contacts. I read somthing about it in “6.1.3 Exclude my addresses”, but do’nt understand it because my English is not very good.

Yes, I recommend that you put all of your addresses on your card in the Contacts app. This will help SpamSieve catch spams that were made to look like you sent to yourself.

Thank you. I think now I understand it.