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assume a dns cname record mail.<domain>, pointing to the hostname of the mail server, for clients to connect to

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the autoconfig/autodiscover endpoints, and the printed client settings (in
quickstart, in the admin interface) now all point to the cname record (called
"client settings domain"). it is configurable per domain, and set to
"mail.<domain>" by default. for existing mox installs, the domain can be added
by editing the config file.

this makes it easier for a domain to migrate to another server in the future.
client settings don't have to be updated, the cname can just be changed.
before, the hostname of the mail server was configured in email clients.
migrating away would require changing settings in all clients.

if a client settings domain is configured, a TLS certificate for the name will
be requested through ACME, or must be configured manually.
This commit is contained in:
Mechiel Lukkien
2023-12-24 11:01:16 +01:00
parent e7478ed6ac
commit da3ed38a5c
8 changed files with 80 additions and 9 deletions
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8
config/doc.go
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@ -638,6 +638,14 @@ describe-static" and "mox config describe-domains":
# Free-form description of domain. (optional)
Description:
# Hostname for client settings instead of the mail server hostname. E.g.
# mail.<domain>. For future migration to another mail operator without requiring
# all clients to update their settings, it is convenient to have client settings
# that reference a subdomain of the hosted domain instead of the hostname of the
# server where the mail is currently hosted. If empty, the hostname of the mail
# server is used for client configurations. (optional)
ClientSettingsDomain:
# If not empty, only the string before the separator is used to for email delivery
# decisions. For example, if set to "+", you+anything@example.com will be
# delivered to you@example.com. (optional)