"Sendmail was written to operate in a dynamic and changing network environment. Standards were minimal and inconsistently applied. Addressing varied from network to network. To be useful, a mail routing program had to be flexible and configurable. A new network might pop up and you had to have a way to route mail to it. There were numerous gateway machines between networks and sometimes you had to maintain a list of them and keep trying different gateways until you found one that was listening on your network. Instead of having to deal with one standard, like the Internet Protocol (IP) that is familiar today, e-mail transmission had to account for multiple standards on diverse networks.
(Submitted by Noel Fri Jun 4, 2004 )
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