send multiple lines of text in body using -mail-

Dear Forum Users,

I am using a MAC: I just discovered the user-written command -mail- which only works on MAC as far as I understand.

The command allows to send lines of text extracted from a using file. I do manage to include the first text line of the using file to the body of the mail that is sent out - but I would like to include the first four lines actually. I.e. I am wondering if and how it is possible to include multiple lines of text in the mail body using -mail-.

My syntax looks as follows:
mail From: me@me.com; To: other@other.com; Subject: test;dear other using example.txt

where example.txt is a text file with 8 lines of text. What am I doing wrong?

Thanks for your support.

Darjusch