Hello,
Running IIS5 and using as SMTP gateway for messaging environment.
The SMTP queue grows (3000+) until the server is restarted. Queue goes back down to ~2200 (a lot of NDR's for spam) then seems to gradually grow again.
The frequency of this problem is increasing. Running performance counters on outbound connections and after restart this number increases to 15-20 then pretty quickly goes back down to between 0 - 5 connections every minute.
One thing that has changed is there is a NAT on the firewall so that sent messages have headers re-written and the IP address of the server is changed. This is not for SPAM but our ISP had a huge block of internet IP blocks DNSBl'd by SPEWS.ORG so this is helping resolve that issue. We are a very legitimate company with strict anti-SPAM guidelines.
Has anyone seen this before? What troubleshooting can be done? No events logged in sys logs to help.
Thanks in advance.
DannoSV
Running IIS5 and using as SMTP gateway for messaging environment.
The SMTP queue grows (3000+) until the server is restarted. Queue goes back down to ~2200 (a lot of NDR's for spam) then seems to gradually grow again.
The frequency of this problem is increasing. Running performance counters on outbound connections and after restart this number increases to 15-20 then pretty quickly goes back down to between 0 - 5 connections every minute.
One thing that has changed is there is a NAT on the firewall so that sent messages have headers re-written and the IP address of the server is changed. This is not for SPAM but our ISP had a huge block of internet IP blocks DNSBl'd by SPEWS.ORG so this is helping resolve that issue. We are a very legitimate company with strict anti-SPAM guidelines.
Has anyone seen this before? What troubleshooting can be done? No events logged in sys logs to help.
Thanks in advance.
DannoSV