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+# Welcome to the hermes wiki!
+
+## A few bits of information I found useful
+
+### From src/Utils.cpp
+
+decide whether a triplet should be greylisted or not basically it follows this diagram:
+
+ <pre>
+ +------------------------------------------+
+ |                                          |yes
+ | whitelisted?(IP or TO or DOMAIN or HOST) |----> don't greylist
+ |                                          |
+ +------------------------------------------+
+               |
+               | no
+               |
+               v
+ +----------------------------------+
+ |                                  |yes
+ |    blacklisted? (IP or FROM)     |----> greylist
+ |                                  |
+ +----------------------------------+
+               |
+               | no
+               |
+               v
+ +----------------------------------+
+ |                                  |yes
+ |    greylisted? (triplet)         |----> greylist
+ |                                  |
+ +----------------------------------+
+               |
+               | no
+               |
+               v
+         don't greylist
+ </pre>
+
+### The sqlitedb
+
+Hermes only ever writes to the greylist table. All other tables are for the user to fine tune Hermes's behaviour.
+
+For example, to allow all mail from example.com to pass through Hermes unhindered:
+
+<pre>sudo sqlite3 /var/hermes/greylisting.db
+SQLite version 3.9.2 2015-11-02 18:31:45
+Enter ".help" for usage hints.
+sqlite> .tables
+allowed_domains_per_ip  blacklisted_tos         whitelisted_ips       
+blacklisted_froms       greylist                whitelisted_tos       
+blacklisted_ips         whitelisted_domains   
+blacklisted_todomains   whitelisted_hostnames 
+sqlite> insert into whitelisted_domains values ('example.com');
+sqlite> select domain from whitelisted_domains;
+example.com
+
+</pre>
+
+### Greylist options explained:
+
+<pre>
+# greylisting options.
+
+# initial expiry time.
+# when email is first recorded, it will expire after this time (in minutes).
+initial_expiry = 240
+
+# initial period of time (in minutes) during which a retry on the spammer's side will FAIL.
+initial_blacklist = 5
+
+# once we have whitelisted a triplet, how long it stays whitelisted (in days).
+# 36 is a magic number, is the maximum days between a day and the same day next month
+whitelist_expiry = 36
+</pre>
+The above options can be translated as follows:
+
+* Hermes will greylist an email based on IP address of sender, RCPT TO: and MAIL FROM:
+* That tripet will be greylisted for 4 hours.
+* If the tripet is seen again within 5 minutes of initial connection, it will be greylisted again.
+* If the tripet is seen again after 5 minutes of initial connection, it will pass unhindered, and will subsequently pass unhindered for the next 36 days.