The Router can route an entire domain (domain name) to a certain local Account, if the .local domain suffix is used (see above).
This method is useful if:
Unified domain-wide Accounts are useful if the client systems retrieves messages from your Server using the CommuniGate Pro RPOP or similar software that distributes retrieved messages locally. Alternatively, the client system can use a regular single-user mailer and then distribute retrieved messages manually.
While the information in the local part of the client1.com addresses is not used for routing, it is not discarded. When the Local Delivery module stores the message in the client1 Account, it stores the local parts of the addresses in the X-Real-To: message header field (or other field specified in the Local Delivery module settings).
Router alias record also stores all messages sent to the client1.com domain in the client1 Account, but if such a record is used, the information about the local part (Account name) would be lost, and no X-Real-To: head fields would be generated. The client software that retrieves messages from this Unified Account would have to rely on the To: and Cc: message header fields. Those fields do not always contain the correct information, and they never reflect any change in the local part of the address you could have done with some additional routing records.
The POP module allows individual users to retrieve mail from a Unified Account, by hiding out all messages that do not contain the specified username in the X-Real-To header field.
You usually create Unified Domain-Wide Accounts in the Main Domain. Use the .domain suffix to create an UDWA in a Secondary Domain. Messages routed to email@example.com will be stored in the accountname Account in the domainname Domain, with the xxx address being added to the message headers as the X-Real-To field. For example, a Domain Administrator for the company.com Domain may use the setting: Mail To Unknown Addresses is Redirected to:*%Unknowns@company.com.domain and messages sent to unknown Domain Accounts will be stored in the Account Unknowns, with all those unknown addresses stored in the message X-Real-To header fields.