Robuta

https://www.mail-archive.com/s-mailx@lists.sdaoden.eu/msg01336.html

https://www.mail-archive.com/s-mailx@lists.sdaoden.eu/msg01247.html

https://launchpad.net/ubuntu/bionic/arm64/heirloom-mailx

https://www.mail-archive.com/search?l=s-mailx@lists.sdaoden.eu&q=subject:%22Re%5C%3A+%5C%5BS%5C-mailx%5C%5D+microsoft+outlook+server+with+xoauth2%22&o=newest&f=1

https://www.mail-archive.com/s-mailx@lists.sdaoden.eu/msg01314.html

https://www.mail-archive.com/s-mailx@lists.sdaoden.eu/msg01335.html

https://www.mail-archive.com/s-mailx@lists.sdaoden.eu/msg01261.html

https://www.mail-archive.com/s-mailx@lists.sdaoden.eu/msg01312.html

https://www.linuxfromscratch.org/blfs/view/10.0/basicnet/mailx.html