The "Manage Accounts" tab → "Send/Receive Restrictions" sub-page enables you to define and enable or disable sending and receiving restrictions that can limit the domains and subdomains emails are sent to or received from. Additionally, you can create exception lists for the set restrictions.
From the "Send" context you can allow emails to be sent to all domains, only to local domains, only to local domains and subdomains or to disallow the sending of emails regardless of the recipient's domain. For a higher degree of flexibility, specific exceptions can be defined for any of the options you choose.
From the "Receive" context you can allow emails to be accepted from all domains, only from local domains, only from local domains and subdomains or to disallow the receiving of emails regardless of the sender's domain. For a higher degree of flexibility, specific exceptions can be defined for any of the options you choose.
The exceptions are defined as a pattern that supports "*" and "?" wildcards, the first one replacing any character for any number of occurrences, the second one replacing any character for only one occurrence. It is possible to specify multiple exceptions by adding them one by one, and creating a list of exceptions.
A complete list of the options that can be set is:
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Enable / Disable sending restrictions
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"Allow only local domain" / "Allow only local domain and subdomains" - allows sending only to the same domain / allows sending to the same domain and its subdomains
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"Allow all domains" / "Disallow all domains"
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Enable / Disable receiving restrictions
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"Allow only local domain" / "Allow only local domain and subdomains" - allows receiving only from the same domain / allows receiving from the same domain and its subdomains
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"Allow all domains" / "Disallow all domains"
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Restrictions apply for messages sent from:
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WebMail: An NDR will be returned if the destination address is not allowed.
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SMTP / Outlook Connector: The "RCPT TO" command will yield a permanent error if matched.
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Sendmail wrapper: An NDR will be returned if the destination address is not allowed.
The rejection error in the NDR will be: postmaster@yourcompanyname.com : Permission denied
Once your changes are complete, save them by clicking the "Save Configuration" button.