George Forman: > The DNS record is hosted by primary A. Primary A determines if > the account is to be sent to secondary B (a Postfix MTA). When > secondary B, tries to deliver the mail via lmtp and lmtp rejects > depositing the mail message,a bounce message is generated. This > bounce message must be sent backto the primary A server. Primary
The primary MX host MUST REJECT mail for invalid recipients. If you accept such mail and then bounce it, then you are a source of backscatter mail and people actually blacklist such mail servers. http://en.wikipedia.org/wiki/Outscatter Wietse
