It appears that I'm lacking relevant specifics. Let me cure that. I'm using the
Zimbra/Samba walk-through.
What I would prefer is separation of church and state. I would prefer that:
1) All mail related services (webmail/IMAP) be accessible via the
dns name: mail.example.tld
2) All ldap communication be accessible via the
hostname: hostname.example.tld
3) The certificate allows, and is functional for both.
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I've attempted to use zmsetservername mail.example.tld but this breaks ldap; the uri needs to be hostname.example.tld
Sorry about the confusion.