I well remember the times when I set up sendmail and saw emails immediately sent in Netscape Mail instead waiting for minutes. This was using a 32kB dialup conn

I well remember the times when I set up sendmail and saw emails immediately sent in Netscape Mail instead waiting for minutes. This was using a 32kB dialup connection. Was like 1997. Needless to say it was then sendmail struggling to get the mails over dialup. At least my single-threaded Netscape was responsive. Worked until 1999 or so. Then spam became a thing and more and more mails were rejected and I folded my setup.