Swiftmailer works for me. I am using the following:
EmonCMS Version: low-write 10.2.7
Python 2.7.16
PHP 7.3.19-1
I do recall that in order for swiftmailer to work properly with EmonCMS, it needed to be as such:
“git -C /opt/emoncms/modules clone -b ‘v5.4.8’ --single-branch
GitHub - swiftmailer/swiftmailer: Comprehensive mailing tools for PHP”
Reference this link:
“If Watt Feed goes to Zero Send Email - #8 by TrystanLea”