Based on comments made by Wietse, it looks like my server is in good shape as the connections are not even taking a second and the whole process is taking roughly a second.
Based on what Viktor is saying, this line could be a problem Sep 12 09:39:56 pmx1 postfix/smtpd[30058]: connect from unknown[192.168.0.86] as it could to take some to time to attempt resolve this dns. Is this correct? On Thu, Sep 12, 2013 at 9:47 AM, Viktor Dukhovni <postfix-us...@dukhovni.org> wrote: > On Thu, Sep 12, 2013 at 09:12:59AM -0400, Roman Gelfand wrote: > >> We have a program which every so often sends a request, using chilkat, >> to postfix to send out email with attachment. With every send it has >> to connect to postfix using sasl authentication. Each send appears to >> take a long time. In the absence of more detailed information, I am >> guessing the connection is taking most of the time. > > Don't guess measure. The mail logs record four delay measurements for > each message: > > postfix/smtp[<pid>]: <queue_id>: to=<rcpt>, ... delays=a/b/c/d, ... > > The components of the "delays" field are: > > a. Time elapsed between message creation and the message entering > the active queue. With SMTP the clock starts at the first > accepted "RCPT TO:" command. This does not include the time > from the client's TCP SYN to initiate the connection until > the server responds with "250" to "MAIL FROM:". > > The start time is that of the log entry of the form: > > postfix/smtpd[<pid>]: <queue-id>: client=... > > If your client's IP address triggers slow (failing) PTR > lookups, or slow forward lookups of the resulting name > that time is not seen in the Postfix logs as the > first log message > > postfix/smtpd[<pid>]: connect from ... > > is logged after attempting to reverse resolve the client's > IP address. > > b. Time spent in the active queue, large delays here show a congested > destination or an overall congested queue. > > c. Time taken to connect to the remote destination, from the delivery > agent receiving the request to deliver the message to the beginning > of the mail transaction (with SMTP, sending MAIL FROM:) > > d. Time taken to complete the mail transaction. > > Report all logging for your "slow" deliveries, from the "connect from ..." > message with the same process id as the "smtpd: <queue_id>: client=" message > including all messages with that queue-id, until the "disconnect from". > > You may find the Perl script in: > > http://www.mail-archive.com/postfix-devel@postfix.org/msg00292.html > > useful. > > -- > Viktor.
