On Mon, Apr 28, 2014 at 01:23:41PM -0400, Wietse Venema wrote:
> Xie, Wei:
> > [Symantec support issue]
>
> As Viktor noted, it is possible that they slow you down because
>
> - You're sending mail from a new IP address that has no reputation,
>
> - or you're sending mail from an old IP address that has sent them
> spam in the past,
>
> - or there is something about your DNS records that they don't like
> (the IP address is embedded in the name of the A/PTR record, or the
> PTR record name does not match the A record),
>
> - or Postfix is configured to use a myhostname that does not match
> the A/PTR record,
>
> - or you have not updated your SPF record to include the new machine,
>
> - or a list of other things.
Or local shot in foot via rate delays or overly low concurrency
ceilings, be these perhaps motivated by strict receving system rate
ceilings. If the receiving system makes it difficult enough to
send mail get the problem fixed on their end, I am under the
impression you're paying them money to be your service provider.
--
Viktor.
