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Old does not mean bad. It does not automatically mean good, but it is usually correlated with good, since bad things tend to get washed away. How many people still use PrimOS or Banyan Vines?
The initial release of Unix was about 50 years ago. The initial release of BSD somewhere between 40 and 45. Most insurances and banks run on an OS whose first release was ~60 years ago (IBM mainframe). I don't know exactly how to define the age of TCP/IP implementations, but it is about 50 years old (and Vint Cerf is still around, bright and cheerful).
Old does not mean bad. It does not automatically mean good, but it is usually correlated with good, since bad things tend to get washed away. How many people still use PrimOS or Banyan Vines?
Mail is only insecure if administered by clueless people. While I'm sure the NSA does its best to monitor e-mail, the underlying protocol smtps is as hard to spy on as https and ssh. And the claim that nobody uses it is made ridiculous by looking at my various mailboxes, which have dozens or hundreds of messages per day.
Of those three, only one applies to sendmail: It is certainly complex. But that is for a reason: It is exceedingly powerful. A lot of that power was needed in the early days (when we did things like tunneling uucp mail over bitnet, remember e-mail addresses that had to have @, % and ! to get there). It is neither bloated nor insecure when administered competently.
