email cert move from domain to subdomain

Discussion in 'Installation/Configuration' started by Looking_Behind, Dec 27, 2021.

  1. Looking_Behind

    Looking_Behind New Member

    ISPConfig 3.1.15p
    Debian 9 (stretch)
    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 "" and now needs to use "" because "" 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 and begin working with the ?

    Any help would be extremely appreciated! Being a live environment, I am hesitant to experiment.
  2. Taleman

    Taleman Well-Known Member HowtoForge Supporter

    Quite old, you really should consider upgrading.
    Creating a website and ISPConfig creating the LE certificate gets you the needed certificate, then you need to configure mail to use that.
    Other method is to install a new ISPConfig system, put hostname to and use Migration Tool to copy over data from old server to new. You also get to current version of ISPConfig and Debian.
    You should set up a test ISPConfig host, where you can experiment.
  3. Looking_Behind

    Looking_Behind New Member

    Thank you for the QUICK reply! That's awesome! Really impressive.

    That's what I suspected. Considering all the updates available and the need for a test environment, I may setup a new temporary system and keep it alive after the migration back to the server is complete. Thanks!
  4. Th0m

    Th0m ISPConfig Developer Staff Member ISPConfig Developer

  5. Looking_Behind

    Looking_Behind New Member

  6. Th0m

    Th0m ISPConfig Developer Staff Member ISPConfig Developer

    If you create a separate website for the subdomain, yes.

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