Viktor Dukhovni:
> On Tue, Jan 28, 2014 at 03:58:45PM -0500, Wietse Venema wrote:
>
> > Otherwise, you can set the Postfix tcp_windowsize to a non-zero
> > value to slow down email. I have used a value as low as 512 to keep
> > a low-speed backup connection usable. For this a simple "postfix
> >
Wietse Venema wrote:
> [thundering herd problem]
> > When the sender exceeds the smtpd_client_connection_count_limit,
> > they will get a 4xx deferral. When they retry delivery is out of
> > your control -- some may retry in a few minutes, other hours, a few
> > never (although not retrying is non-
Viktor Dukhovni wrote:
> Bob Proulx wrote:
> > Periodically a large wave of email from the mailing lists will be
> > unleashed. Such as when upstream connectivity is down for a while
> > causing a backlog and then it is restored causing a transfer of the
Probably due to high load on the server th
On Tue, Jan 28, 2014 at 03:58:45PM -0500, Wietse Venema wrote:
> Otherwise, you can set the Postfix tcp_windowsize to a non-zero
> value to slow down email. I have used a value as low as 512 to keep
> a low-speed backup connection usable. For this a simple "postfix
> reload" is not sufficient. Fo
[thundering herd problem]
> The bigger problem is that one or two connections from a
> well-connected client will still overwhelm your bandwidth. The real
> solution is traffic shaping or QoS to limit the bandwidth used by
> SMTP. Your firewall software or your router may already have this
> featu
On Tue, Jan 28, 2014 at 12:53:41PM -0700, Bob Proulx wrote:
> Periodically a large wave of email from the mailing lists will be
> unleashed. Such as when upstream connectivity is down for a while
> causing a backlog and then it is restored causing a transfer of the
> backlog. Then the upstream E
On 1/28/2014 1:53 PM, Bob Proulx wrote:
> Looking for advice...
>
> I have a Postfix mail server on a relatively slow 1.5Mbit/s dedicated
> link. (It used to be relatively fast. Now it is relatively slow.)
> It receives a lot of mailing list email from a well connected mailing
> list server runn
Looking for advice...
I have a Postfix mail server on a relatively slow 1.5Mbit/s dedicated
link. (It used to be relatively fast. Now it is relatively slow.)
It receives a lot of mailing list email from a well connected mailing
list server running Exim.
Periodically a large wave of email from t
