General help

I am uploading users from a CSV file. I see that in upload users you can set mailformat. But I don't know what to enter in that column. Would I create column "mailformat" and enter "text" in every row.

http://docs.moodle.org/en/Edit_user_accounts
says (note the absence of info at mailformat)

• mailformat e.g. (1)1=
• maildigest e.g. (0)0=No digest. Single email per forum post; 1=Complete. Daily email with full posts; 2=Subjects. Daily email with subjects only
• maildisplay e.g. (2) 0=Hide my email address from everyone; 1=Allow everyone to see my email address; 2=Allow only other course members to see my email address