Setting up a simple mail server, on a Raspberry Pi
SMTP, has its name suggests, is simple. It is, really is, until you have a need to deploy one yourself today. It was way easier twenty years ago when the Internet was a benign place, and every Windows XP came with a solid SMTP server out of the box, and enabled for unrestricted relay for all! In this age of abundant cloud services, why would one still need to set up your own MTA? In my case, it was because of the limited SMTP capability of a couple of (very) old webcams I have. One works only without encryption. One works only if the password is less than 64 characters. SendGrid is a reliable free service for up to 6,000 mails a month. But it uses a super-long password. My intention was to use SendGrid as the relaying MTA ("smarthost") because of its sender reputation . It is easy to configure an MTA to do the actual delivery, ie make it connect to the MX server of every addressee in each mail and deliver the mail. However, such mails sent will likely be treated as spam