Christian R??ner: > I searched allover the docs, but could not find information, if > the smtp-client of Postfix can do the PIPELIING extension.
Have you tried "man 8 smtp"? Wietse SMTP(8) SMTP(8) NAME smtp - Postfix SMTP+LMTP client ... STANDARDS RFC 821 (SMTP protocol) RFC 822 (ARPA Internet Text Messages) RFC 1651 (SMTP service extensions) RFC 1652 (8bit-MIME transport) RFC 1870 (Message Size Declaration) RFC 2033 (LMTP protocol) RFC 2034 (SMTP Enhanced Error Codes) RFC 2045 (MIME: Format of Internet Message Bodies) RFC 2046 (MIME: Media Types) RFC 2554 (AUTH command) RFC 2821 (SMTP protocol) --==>> RFC 2920 (SMTP Pipelining) <<==-- RFC 3207 (STARTTLS command) RFC 3461 (SMTP DSN Extension) RFC 3463 (Enhanced Status Codes) RFC 4954 (AUTH command) RFC 5321 (SMTP protocol) RFC 6531 (Internationalized SMTP) RFC 6533 (Internationalized Delivery Status Notifications)