Multiple recipients with sendmail

Hi,
I use the following to send a mail :
sendmail -v someone@box.com < /appli/oracle/rap.txt

Can I give several mail address for destination ? How ?

For exemple :
sendmail -v someone@box.com, someone2@box.com, someone3@box.com < /appli/oracle/rap.txt

Thank you.

Yes, but use a space as a separator, not a comma.

Normally with sendmail I create an alias and put multiple recipients email addresses in a file.

ok Neo.
how do you put the addresses in poets.list ? can you give an example of poets.list file ?

Neo is quoting from "man aliases".

actually what Neo told was not very clear. Neo can you give an example and explain.

Thanks in advance

The format of this example file /usr/local/lib/poets.list is just a vertical list of mail addresses (one per line).
e.g.

user1@domain1.com
user2@domain2.com

Because the list is not held in the aliases database you don't have to rebuild the aliases database every time you change the list.
You do have to rebuild the aliases database once to get the "aliasname: :include:/filename" line into the aliases database.