Re: postfix delivery delay causing duplicate mail delivery
- On Thu, Nov 01, 2012 at 08:37:43AM +0800, Fred Ho wrote:
> The problem happened intermittently with different senders andThis is not the case, the queue-manager processed the message as
> I found it usually involved multiple recipients and have attachments.
> What I don't understand is Postfix qmgr took over 2 hours later
> to process that stucked mail while the ISP has retried the mail
> 2nd time in less than an hour and was delivered successfully. I
> don't see any deferred mails though.
soon as it entered the queue.
> I deliberately tune up the timeouts to see if it's the problem.Wrong timeouts (output not input) and unwise tuning. Revert to default
As I said before:
> You can add one of the more frequent problem senders to "debug_peer_list"--
> and we'll see when the SMTP server receives ".<CRLF>". Otherwise you
> need to capture a tcpdump "pcap" file of the problem transactions and
> look at packet timestamps.