When in doubt, you can check the scribo(1) man page (available on the host system).

scribo(1) Wrote:

Code:

-a address
    Only process emails originated from address. This will be checked against the internet address extracted according to the rfc5322 specification.

Upon reading an email, scribo will parse the headers, and check the "From:" field of the email. If the email address (usually enclosed in "<>" match the string you specified with the -a flag, then the mail is "accepted" and written on disk.

It means that when you want to post something on your rlog, the "From" should be the address set in your .forward file, and the "To" should be "$USER@g.nixers.net", where $USER is your account (for you, ramiferous@g.nixers.net indeed).

Hope it makes things clear ! I should probably reword the FAQ, as it is definitely not explicit enough.