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You can specify the IP to be used to transmit emails to remote server. If you do not specify it, the interface default gateway IP will be used.
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Define  this IP number only if you need it to resolve an issue with an SPF definition.  Most of the time this field can stay blank.
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You can limit the maximum disk space used by all users within all domains within this  group. If the limit is reached, all user's email within this group will be rejected with  a status  "space missing".
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The time zone is used to display the time in a user's logs depending on the user's group's geographical area.
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The purpose for the Clement's URL  is to set properly the link within emails sent time to time to the group's users, make sure to have a DNS entry on that host name to allow this  group's users to click on the link provided within email.
