The Hiawatha v10.2 source package contains a script which can be used to retrieve a Let's Encrypt certificate. A few changes have been made to the AccessList and PasswordFile option to make the obtaining of a Let's Encrypt certificate easy. Consult the manual page for the details. The script can be found in the source package in the directory 'extra'.
Thank you Hugo.
This is good update, a lot of people use it and will use in the future. Anyway, this is 1st time i got mail about update to my spam box, check on your side if your mail server have all what need, dkim, dmarc, spf records etc.. you can test all with mail-tester.com, you need to get 10/10.
Cheers!