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Beginning with V8.7 sendmail, notification of successful, deferred, or failed delivery is now done by using DSN (see RFC1891). The T= delivery agent equate provides three pieces of required information to DSN. The pieces are separated by the slash character: T=mta-type/addr-type/diag-type The first piece, the mta-type, is later supplied to the Reporting-MTA: DSN header as its first argument: Reporting-MTA: dns; here.us.edu The second piece, the addr-type, is later supplied to the Final-Recipient: DSN header as its first argument: Final-Recipient: rfc822; badname@here.us.edu The third piece, the diag-type, is later supplied to the Diagnostic-Code: DSN header as its first argument: Diagnostic-Code: smtp; 550 <badname@here.us.edu>... User unknown If the P= for a delivery agent is [IPC], an undeclared mta-type defaults to dns, an undeclared addr-type to rfc822, and an undeclared diag-type to smtp. For any other P= the default for an undeclared entry is NULL. In configuring with the m4 technique, the declarations of the T= delivery agent equates are: T=X-Phone/X-FAX/X-Unix Other than for the local delivery agent, you cannot change these T= defaults. If the need arises, you can, however, copy an existing delivery agent definition and then modify it as outlined in Section 20.3.2. |
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