On 31.08.2018 21:31, Michael Schumacher wrote: > > certbot works only with ports 80 or 443? Can lego work with with IMAP > ports like 143 or 993? The documentation is not very clear. > in case of other then Webserver you use ACME-DNS just for a simple ACME client that is capable for ACME-DNS use acme.sh https//acme.sh/