The e-mail's wording is pretty important, but just as important would be the title...
What kind of title would get a person to open that e-mail?
Welcome back we have your cat hostage!
Great news! We have permanently banned Nalo Jade from posting!
Strange news! We have discovered that Fionn is not in disguise but actually part of a cloning program!
Mikayla has finished the ALFA WARS saga, its a best seller, get a free copy!
We no longer request donations! Instead, Zicada has offered to buy you a PC to run NWN2!
ALFA has endorsed Obama!
ALFA has endorsed McCain!
ALFA is now known as a "group of people that know where you live and they demand you play" GoPtKwYlAtDyP for short.
If you don't read this E-mail we will slap you with trout!
TL;DR
...Or more serious ones if that's your thing....
Greetings from A Land Far Away!
NWN1 & NWN2 Global Events scheduled to occur soon.
Calling all retired players for Global ALFA Event!
ALFA wants you to return!
(Things to consider including in e-mail)
New Haks - simplified way of getting set-up (that's all you Zic

)
(explanation of what cool things are included... like the awesome new tilesets for NWN1 that we don't have.)
New Games - List of open DM slots, Campaigns & Player groups looking for players.
New Moderation policy - Explanation of how much calmer/friendly the community is.
New rules - Include any changes to rules that make the community seem more fun... races, RP spells, classes, systems ... ect..
New DM positions - List of HDMs seeking DMs for their servers. (in case we someone was more interested in DMing.)
Builder? - List of Servers that are still available for building, and ones that are accepting builders to help out current projects.
Over all imo you need to portray ALFA as something new...with some friendly old faces...
People aren't here because they "forgot" about us... on the contrary they "remember" and choose to stay away, so make them wonder if something major has actually changed...BUT.
Lets make damn sure things have changed, because we only get once chance to make a good second impression.
The rules changing thread was the GREATEST civil / heated discussion I have seen in years. Imagine if that topic had been raised a few years ago. Really good job everybody keeping their "head"...that was pretty cool. I was impressed, really.
"The reasonable man adapts to fit the world. The unreasonable man adapts the world to suit him. Therefore all progress is achieved by the unreasonable." - unknown
removed self from forums, contact via E-mail. Adios.