[kwlug-disc] what is the probable cause of mail downloading being painfully slow?

Khalid Baheyeldin kb at 2bits.com
Sat Dec 27 17:26:22 EST 2008


If DNS is the issue, then switch to the free DNS servers at Level 3.

Add this to the /etc/resolv.conf file:


# Level 3 DNS servers
nameserver 4.2.2.5
nameserver 4.2.2.6

Before the Rogers ones.

If nothing else, it will eliminate DNS as a cause.

On Sat, Dec 27, 2008 at 5:03 PM, unsolicited <unsolicited at swiz.ca> wrote:

> Chris Frey wrote, On 12/27/2008 4:52 PM:
> > Has anyone watched the POP3 protocol in action during these delays?
> > Perhaps it is an overloaded server.
> >
> > You can telnet to the POP3 port and do things manually as well, and see
> > if the delay is seen there, or if it is just a fetchmail thing.
> >
> > I can't imagine it would be a DNS issue between messages, since it is the
> > same TCP connection.  If it was a DNS issue, it would have to be some odd
> > configuration on the server side that had to look up a domain name for
> > every email.
>
> Perhaps not. Paul reported weird Rogers DNS issues not long ago. Or
> suppose the primary DNS provider doesn't have an answer for the query,
> and it's falling back to query the secondary. Since no answer
> resulted, the query is not locally cached, and each subsequent attempt
> goes through the same failure scenario. Or suppose the initial query
> is given up on and fetchmail moves on. Something akin to fetching a
> web page but the images within are not resolvable.
>
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-- 
Khalid M. Baheyeldin
2bits.com, Inc.
http://2bits.com
Drupal optimization, development, customization and consulting.
Simplicity is prerequisite for reliability. --  Edsger W.Dijkstra
Simplicity is the ultimate sophistication. --   Leonardo da Vinci
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