>> - You're sending mail from a new IP address that has no reputation, The server IP is not a new IP.
>> - or you're sending mail from an old IP address that has sent them spam in >> the past, The reputation for this IP should be good. Never got blocked or warning before from Windows FOPE. >>- 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), DNS record is good. >> - or Postfix is configured to use a myhostname that does not match the A/PTR >> record, The following two settings are existing on RHEL 6.4 and RHEL 5.10. Do we really need to change myhostname to fully-qualified domain name (i.e. cio-krc-pf03.osuad.osu.edu)? myhostname = cio-krc-pf03 mydomain = osuad.osu.edu >> - or you have not updated your SPF record to include the new machine, The machine is already in SPF record for domain 'osu.edu'. >> - or a list of other things. We hope to find out something else. Thanks, Carl -----Original Message----- From: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] On Behalf Of Wietse Venema Sent: Monday, April 28, 2014 1:24 PM To: Postfix users Subject: Re: RHEL 5.10 vs 6.4 performancs difference 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
