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OpenBSD's smtpd has worked well for me. It's also available in a portable version.

https://www.opensmtpd.org/

Configuration is one file, very simple. It won't do everything a sendmail does, but it's never had me pulling my hair out.

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I also am using opensmtpd, and have been for years. Even setting up starttls encryption and a DKIM proxy were simple. I have never had an issue with accidentally setting it up as an open relay or anything else that would place me on a blacklist.

Of course, no MTA is as easy as creating a GMail account, but OpenBSD's smtpd is a lot clearer than any of the alternatives.

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