Spammers nowadays try to send mail fromor mail to every possible name that they can think of. See the MAILDROP_README document for more details. Line 10 the commented out entry text after shows howone would implement catchall virtual alias that receives mailfor every example. com address not listed in the virtual alias table entries or else mail will go tothe wrong domain. Line 2 The virtual_alias_domains setting tells Postfixthat example. com is socalled virtual alias domain. With the example above, mail for postmasterexample. comgoes to the local postmaster, while mail for infoexample. com goesto the UNIX account joe, and mail for salesexample.
catchallmailbox is likely to receive many spam messages, and many bouncesfor spam messages that were sent in the name of master. cf entry thatexecutes nonPostfix software via the pipe delivery agent. If you omitthis setting then Postfix will reject mail relay access deniedor will not be able to deliver it mail for example. com loops backto myself. This is safety mechanismin case someone makes mistake. With the example above, mail for postmasterexample. comgoes to the local postmaster, while mail for joeexample. com goesto the remote address janesomewhereelse. And an examplemaildrop delivery method is already defined in the default Postfixmaster. cf file.
We use this feature toredirect mail for example. coms postmaster address to the localpostmaster. The lookupresult value is ignored by Postfix. You can use the same mechanism to redirect any addressesto local or remote address. Line 10 the commented out entry text after shows howone would implement catchall virtual alias that receives mailfor every example. com address not listed in the virtual alias file. This is not without risk. This is safety mechanismin case someone makes mistake. And an examplemaildrop delivery method is already defined in the default Postfixmaster. cf file.
Line 5 The virtual_minimum_uid specifies lower boundon the mailbox or maildir owners UID. Line 3 The virtual_mailbox_base parameter specifies aprefix for all virtual mailbox pathnames. If you omit thisvirtual_mailbox_domains setting then Postfix will reject mail relay access deniedor will not be able to deliver it mail for example. com loops backto myself. We use this feature toredirect mail for example. coms postmaster address to the localpostmaster. Line 16 This example assumes that in main. cf, myoriginis listed under the mydestination parameter setting. catchallmailbox is likely to receive many spam messages, and many bouncesfor spam messages that were sent in the name of anythingexample. com.