[NTLUG:Discuss] Why use sendmail?

[Wayne Dahl]

Ok guys, here comes another newbie question.

I'm on a dynamically assigned IP (I'm assuming it's DHCP...the router
just gets whatever IP Verizon sends it) and according to the people I
talk to at VASG (Verizon Advances Services Group...I talk to the every
day at work), the lease on the IP could be less than an hour and a
half...as little as 45 minutes.  Now...supposedly, if my router is off
for more than 45 minutes to an hour and a half, I could conceivably get
a new IP.  

Verizon apparently won't assign me a static IP unless I pay business
rates, but they'll give me 5 IP's to use. :P  I only really need one,
but seeing as how they're dynamic, what's the point of using an email
server on my own workstation, even if it *is* free and it's already
there?  No one can reliably email to me using it since the IP changes
relatively frequently (one change is too frequent).

So, I guess I miss the point of using sendmail if I'm not using a static
IP on my own domain.  Please edumacate me on this, if you will.

Thanks, 

Wayne