>We are in need of purchasing and installing our own mailing list server.  I
>know iMail has a built-in mailing list capabilities--but as you know it is
>very limited in operation.

yep, I would never recommend it as an "our-own-mailing-list-server".

>We need a powerful, robust and stable mailing list server that will be able
>to handle...

I've been very happy using Listar on postfix MTA + FreeBSD.  I've 
also set listar+postfix up for hire on Linux with deliriously 
successful results.  One co-lo guy replaced unlimited Lyris 
($2500/month) with my installation of (free) Listar on (free) postfix 
on his Linux box.  40K msgs/hour on a P500 with 512 megs RAM, and the 
machine doesn't sweat.  He's happy.

>   - User choice of HTML or Plain Text e-mail messages.

hmmmm

>   - User choice ot not receiving copy of their own e-mail sent to the list.

yep

>   - Auto subscribe/unsubscribe through web links in list.

yep, plus auto-bounce management, vacation

>  - E-Mail verification before allowing subscribe (to prevent people from
>signing up others against their wishes).

yep

>- Form-Mail capability (replacing special fields with information in
>database or addres book before sending to each person on list).

uh, no that's the application/content level, not the list server plumbing level


>   - Web-based list and archive reading, option to use list strictly through
>web and not receive e-mails.

yep

>- The ability to disallow messages to list from non-members--

aka "closed-subscribe list"

>but at the same time be able to subscribe the same person with multiple e-mail
>originations (meaning, I could send to list as [EMAIL PROTECTED],
>[EMAIL PROTECTED], [EMAIL PROTECTED], but only receive the list messages to
>one of them).

dunno about that.

>- The ability to categorize the subscribers, to multiple lists or to
>multiple categories, that can be used to send only e-mails they want to
>receive, but not information they do not want to receive.

nope

>   - Full moderated features,

yep


>broadcast list features

??

>standard open list

dangerous, but yes

>digest list features.

yes

>   - Preferable if subscribers were in SQL structure that could be
>programmatically changed through external scripting--to include contact
>information about user (name, address, phone, fax, etc).

Listar's members are just a text file like

[EMAIL PROTECTED]  |admin|echopost|flagX|flagY|etc|

your app could write that out to the a list's directory, or with 
Listar's secure email command language, your backend/database app 
could send email commands to listar to add/remove users, change their 
status, etc.

>- Ability to LOCK-OUT e-mail addresses and entire domains, to block e-mail
>addresses that have a problem of getting set-up against their wishes and
>therefore keep complaining about receiving our mailings as unsolicited SPAM.

Listar has an antispam feature, and postfix set up as IMGate has it's 
own level of anti-spam.

>- And of course easy-to use, fool-proof, user interface for using system
>(especially unsubscribes) so as to prevent complaints of SPAM (which we will
>not be using it for).

Listar has CGI for web signup, self-admin

A free detailed program is available for postfix (the SMTP mailer 
engine, ie, like LSMTP or sendmail)

>I would appreciate any suggestions.  This will be used for our large
>web-hosting clients to keep track of their customers so they can send send
>specialized targetted announcements and newsletters.  We would prefer NT,

You'll pay many $1000's, every year, for Lyris or listserv, both 
best-of-class, excellent products.

But I suggest you look at an open source solution. It might just do 
what you want, for free.

Len


http://MenAndMice.com/DNS-training : DNS training for USA and 
Europe
http://BIND8NT.MEIway.com : Binary for ISC BIND 8.2.3 for NT4 & W2K
http://IMGate.MEIway.com  : Build free, hi-perf, anti-spam mail gateways




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