An alias translates an email address into one or more destination addresses. Windows users may understand this concept as a "distribution list." You can add an alias as a convenient shortcut for typing a long list of recipients. An alias can also translate addresses from one top-level domain to another. For example, you can create an alias source domain to translate example.com to a target domain, example-internetsecurity.com. Symantec Messaging Gateway translates email addressed to firstname.lastname@example.org delivered to email@example.com.
Address masquerading is a method of concealing email addresses or domain names behind the mail gateway by assigning replacement values to them. Symantec Messaging Gateway lets you implement address masquerading on inbound mail, outbound mail, or both. A typical use of address masquerading is to hide the names of internal mail hosts so that outgoing mail appears to be coming from a different domain than that of the actual host.
Outbound address masquerades change the apparent sender of a message. Inbound address masquerades change the apparent recipient of a message.
Alias translation only applies to inbound or internal messages processed by Symantec Messaging Gateway. Once the gateway allows email to connect to the inbound scanner, it determines whether the address in the SMTP envelope To: field is an alias and translates it into any destination addresses during the connection session. Transformed addresses are written back to the SMTP envelope To: before the scanner filters the message. The contents of the message To: and Cc: headers are ignored and not changed.
If you employ probe accounts along with aliases and address masquerades you may lose one or the other account. Follow the guidelines for creating probe accounts.
Inbound address masquerading takes precedence over the alias translation. If the same original email address or domain exists in both the address masquerading list and the aliases list, messages to the source domain are routed to the masqueraded address or domain. Symantec Messaging Gateway does not route the message to the alias address or domain.
Except where address masquerading applies to a recipient address, you must add the source domain of an alias to the list of local domains for which Symantec Messaging Gateway accepts inbound email.