ISPMan 0.8.2 Installation and Configuration
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mail_vars

These are Cyrus IMAP servers' variables Note: If you have multiple Cyrus Servers, then you should have the same admin username as pass set on them, which should be ok, if your Cyrus server is authentifying via LDAP

Actually this description is inaccurate in version 0.8.2 of ISPMan. Nearly all variable are related to Postfix.

Unless you are running another MTA other than Postfix most of the default values are acceptable.