ISPConfig 3.1.15p Debian 9 (stretch) php7.0 Apache, postfix+dovecot, LetsEncrypt After following the perfect server guide in August of 2019, I got to a fully functional system. It is not currently updated and I have been tasked with cleanup. The customer decided to have a 3rd party take over website development but wants to keep email. There is only a single domain with email and a raw website configured in ISPC, but the website can be trashed or changed if helpful - it never had content. The issue is DNS and LetsEncrypt renewal. This system was using "domain.com" and now needs to use "mail.domain.com" because "domain.com" now points to the 3rd party website host. Of course, LetsEncrypt can't verify anymore and the certificates for email and webmail have expired. What would be the best method of telling LetsEncrypt to ignore the domain.com and begin working with the mail.domain.com ? Any help would be extremely appreciated! Being a live environment, I am hesitant to experiment.