Depending on the action requested, ECHOBASE will read the message, add the echo to (or update, delete) the echolist database, add a rule file, send a netmail response, announce the echo and forward a submission to the EList.

Rule Update Messages

To: echolist@fidonet.us
Subject: MOD RUL
Body of Message
From: your_email_address
TAG Your_echo_tag
PASSword Your_password
RULEText Rules for Your_echo
Text of the rules goes here
---

Terminating the message

So that Echobase will know when to stop reading the message for keywords, you need to include a line beginning with three-dashes to indicate the end of a message.
---

Here's a final, full example.
This message sends the rules file for the echo GIGO

To: echolist@fidonet.us
Subj: MOD RUL
From: baltimoremd@baltimoremd.com
TAG GIGO
PASSword Iwillnottell
RULEText Rules for area GIGO
An open forum on GIGO and related third party products
OVERVIEW
    This conference is a moderated forum for discussion of issues
    concerning GIGO and related third-party software.
    Conferees can ask questions of the author of GIGO,
    and many of the experienced users in the conference.
    This conference is available both as a FTSC echo, and as a mailing list.
---