Add librehost.dev (LibreHost)

[rjc3rd]

Adds ispdb/librehost.dev.xml for LibreHost (librehost.dev), a small independent email and web hosting provider.

The settings are the same ones we already serve at autoconfig.librehost.dev, so this entry only adds a fallback. It is for customers who keep their DNS elsewhere and have no autoconfig. or autodiscover. record on their own domain, but whose MX points at our mail server (mail.librehost.dev).

• IMAP: mail.librehost.dev, port 993, SSL
• SMTP: mail.librehost.dev, port 465 (SSL) and 587 (STARTTLS)
• Username: full email address, password authentication

I'm happy to change the file if it should follow a different format or naming rule.

🤖 Generated with Claude Code

[babolivier]

Hi @rjc3rd, thanks for your PR!

As explained in our documentation, clients like Thunderbird should be able to find autoconfig files by using the value of the MX record as a base. Following your example, hosting an autoconfig file at https://autoconfig.librehost.dev/mail/config-v1.1.xml should be enough, without needing an entry in ISPDB.

Is there a specific reason why this setup wouldn't work for you?