MacShane, Tracy wrote:
I realise this has been covered before, but I'm having a problem with
getting outbound mail to a destination domain. The ISP in question has
an interesting policy of refusing messages sent to a single email
address in excess of 30/min. Their servers also go on and offline at
random intervals, due to telecoms issues. We have an application that
sends messages to a single recipient on the destination domain, usually
in excess of 200 a day. If a server has gone offline for a while,
naturally we have a backlog of mail waiting to deliver when the server
is up again, and we quickly exceed the 30/min limit.
I've upgraded a server to Postfix 2.5.2 (from 2.2) and tried
implementing a slow transport for this purpose:
master.cf
-----------
# transport for touchy domains
slow unix - - n - 1 smtp
You can add
-o syslog_name=postfix-slow
to the above to differentiate it in the logs so you know it's
being used.
main.cf
---------
slow_destination_concurrency_limit = 1
slow_destination_rate_delay = 2
transport
-----------
solomon.com.sb slow:
Looks correct. Check your work with "postconf -n" and
"postmap -q ..."
However, at the next retry interval, the entire queue is trying to empty
itself concurrently:
Aug 13 15:59:14 smtptest postfix/error[4456]: 4569E15E00F9:
to=<[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>,
relay=none, delay=3283, delays=3282/0.08/0/0.01, dsn=4.4.1,
status=deferred (delivery temporarily suspended: connect to
mx.telekom.net.sb[202.1.161.20]:25: Connection refused)
Aug 13 15:59:14 smtptest postfix/error[4468]: F40FE15E00BD:
to=<[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>,
relay=none, delay=4906, delays=4906/0.08/0/0.01, dsn=4.4.1,
status=deferred (delivery temporarily suspended: connect to
mx.telekom.net.sb[202.1.161.20]:25: Connection refused)
Aug 13 15:59:14 smtptest postfix/error[4476]: 6023715E009D:
to=<[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>,
relay=none, delay=4905, delays=4905/0.08/0/0, dsn=4.4.1, status=deferred
(delivery temporarily suspended: connect to
mx.telekom.net.sb[202.1.161.20]:25: Connection refused)
Aug 13 15:59:14 smtptest postfix/error[4460]: 4061815E00C0:
to=<[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>,
relay=none, delay=4906, delays=4905/0.08/0/0.01, dsn=4.4.1,
status=deferred (delivery temporarily suspended: connect to
mx.telekom.net.sb[202.1.161.20]:25: Connection refused)
[... 75 messages in the queue]
I expect the messages to try filtering themselves out at a rate of one
every two seconds to this destination, not all of them in the same
second. Could someone please clarify what I've omitted or misunderstood
here?
Thanks.
These are not delivery attempts. Delivery attempts are logged
by postfix/smtp.
These are all from the error: service notifying you that the
destination has been throttled because of multiple previous
"connection refused" error.
--
Noel Jones
