If you are wanting to setup a simple PbEM (Play by EMail) game that 
can be setup from a set of basic choices on a webpage then I 
suggest using www.LLamaServer.net which is really excellent. If you need 
something more involved, or direct-connect (which tends to be easier to 
use) then I can probably help. Anything on the LLamaServer setup page is 
available here and feel free to ask me about anything else you think of 
beyond that. I love a challenge.

Direct-Connect play of Dominions 3 is about as easy as multiplaying gets. 
At the menu you select Network, then Connect to Server, tell it the 
server name (such as dom3minions.com), then it wants to know the "port" to 
connect to for that game. After that its pretty much like playing solo.

Such games CAN easily include backup zipz, stats file, who did and didnt 
do turns. Also a rolling scoreboard that can keep track of how many 
provinces, army sizes, dominion rating, VP points, etc for 5 turns or 10 
turns or longer histories. Also email notification of turn being 
available. If not for each player then at least for the person who is 
running the game.

Special features are easily included. Extra large maps, mega-games 
involving multiple eras and 100 players, special maps such as running them 
thru the SemiRandom or Chaotisizer or No-Independents programs. Mod games 
such as CBM, WorthyHeroes, Banners, or totally game altering mods. Modded 
nations made available to players, or as boosted AIs in the game. Also, 
something more easily done on this server than on others is the ability to 
have fluid mods (modified randomly, or at least checked for a possibility 
on each turn).

Particularly the subject of boosted AIs comes up. A "scenario" style game 
can be created which uses "designed AIs". Particularly good for team games 
or co-op games where players would rather play together against the 
computer than against each other. Instead of letting the AI randomly 
choose a god from the usual god list, randomly choose magic, randomly 
choose scales... this can all be designed for the AI. Gods not usually on 
the list, well chosen magic and scales. Also a head start, more start 
provinces, extra castles, AIs allied with other AIs so they do not fight 
each other, and even starter armies and equipment not usually allowed. 

Other Features availabilities:

YES: notifications, backups, just about anything is available. 
Particularly anything on the long list of Dom3 switches.

YES: Email notification when the game processes a turn

YES: email attachment of your turn file

YES: SMS (text message) to your cell phone when the turn processes

YES: Webpage updated when the turn processes.

YES: browser download of turn files

POSSIBLE: browser upload of turn files

POSSIBLE: Instant Message when the turn processes

POSSIBLE: FAX when a turn processes.

POSSIBLE: Having your computer play a wav file to literally TELL you when 
the turn has processed.

POSSIBLE: Having your computer receive the turn file, copy it to the 
dominions directory, play a wav to notify you that the turn is available, 
then start dominions going directly into that game.

Any other possibility I didnt think of? 
If you have seen it on any other Dom3 server then its most likely going to 
be available here. If you have seen it on any other online server for any 
game, then it might be available here. If its something you dreamed up off 
the top of your head but think is impossible, ask me. I love the challenge. 
:)

Gandalf  Parker