Wietse:
> RHEL 5.10 is old. Why are you evaluating it for production?
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.
If they don't like you and each SMTP session needs 3 seconds, then
those delays quickly add up to 1000.
Wietse
