web based mail

[CAA]

hi all,

   i was wondering if there's anyone here who gives web based mail services to 
their customers.  if so, what package/application can you suggest w/c, based on 
ur experiences is proven to work in a nice and stable way.  (and also those w/c 
will allow u to sort ur email in diff folders just like hotmail and rocketmail.

TIA,

chad

hostname & domain name changing

[caa]

hello,
  when i installed my debian box, i only put in some out of nowhere hostname 
and domain names, now it seems that i need to give it some real hostname and 
domain name that really exists.
  can someone direct me please as to what files (all necessary files) that i 
should change for me to go about this.
any help will greatly be appriciated.
caa

filename conversion

[caa]

hello everyone,
  i just uploaded some 800++ files to my debian box (from a windoze box) and 
found out that all filenames had been transformed to their uppercase equivalent 
...
  anybody knows how do i convert all these files back to their lowercase 
equivalent while keeping the numbers and the dots intact ?
TIA,
chad

shell scripting

[caa]

  i want to write a little shell script called "addmailuser" w/c executes 
"adduser --conf /etc/mailuser.conf" where mailuser.conf contains info like 
making their default shell /bin/false.
  in dos, that "addmailuser" file will simply contain "adduser --conf 
/etc/mailuser.conf %1" where %1 is the first parameter that it sees, that is, 
the name of the user i want to add ... but how do u do this in linux ???
  hope someone can guide me on this,
TIA
caa

smail or sendmail

[caa]

  i will be setting up a mailserver for the first time, can someone
please suggest to me as what should i use, smail or sendmail ..
  i have tried using smail b4 and found it easy, but i only had a dial
up (dynmic ip) connection then and also just used my ISPs forwarders, i
am having a domain this time now.  are their any additional tricks when
configuring a SMTP mailserver ?
thanks a lot
caa