[noob] Can create www.example.com but mail.example.com fails

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My domain is:

I ran this command:
On the virtualmin panel "request certificate for

It produced this output:

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator webroot, Installer None
Renewing an existing certificate
Performing the following challenges:
http-01 challenge for alternatememories.com
http-01 challenge for mail.alternatememories.com
http-01 challenge for www.alternatememories.com
Using the webroot path /home/alternatememories.com/public_html for all unmatched domains.
Waiting for verification...
Cleaning up challenges
Failed authorization procedure. mail.alternatememories.com (http-01): urn:ietf:params:acme:error:dns :: Fetching https://www.mail.alternatememories.com/.well-known/acme-challenge/nGMw_nw7th3Bi58cdfE6GHvwGgpdDTj6TAzGJ7jOLBc: DNS problem: NXDOMAIN looking up A for www.mail.alternatememories.com - check that a DNS record exists for this domain

My web server is (include version):
Server version: Apache/2.4.29 (Ubuntu)
Server built: 2020-08-12T21:33:25

The operating system my web server runs on is (include version):
Ubuntu 4.15.0-141-generic

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don't know):

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
Virtualmin 6.16

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):

The www.alternatememories.com cert is retrieved fine. I don't know why its looking for www.mail.alternatememories.com. All mail servers are working ok, but I have to override the exception in the mail client to useit, which is the problem I'm trying to solve.

Is it possible the DNS entries are borked? Thanks.

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Welcome to the Let's Encrypt Community, Carter :slightly_smiling_face:

Your webserver is 301 redirecting from http://mail.alternatememories.com to https://mail.alternatememories.com to https://www.mail.alternatememories.com. If it's not coming from your apache configuration file (see sudo apachectl -S), you might have some RewriteRules in an .htaccess file causing this to happen.

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Thanks, that was it.
In my case it was all done in the sites .htaccess file (for anyone who gets hit by this in the future, a rule to force all non-www prefixes was clobbering the mail one too,)

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