You can start by sending an email to email@example.com
to request a login account on docs.slackware.com (tell us which login name you prefer).
Then I suggest that you create something like the not-yet-existing http://docs.slackware.com/howtos:net...s:sendmail_spf
or if you like, any other page name that starts with http://docs.slackware.com/howtos:network_services:
The " : " characters are something like separators and the stuff that they separate is called a "namespace" (on the physical server they correspond to subdirectories).
In other words, yours will be a page in the "network_services" subsection of the "howtos" namespace.
Don't worry about formatting if the task looks daunting, one of the admins will QA your work. We highly value any submission.