On 7/14/2011 5:55 PM, Stan Hoeppner wrote: > On 7/14/2011 6:58 AM, Peter Tselios wrote: >> Hallo, >> I need to prepare a presentation for my company because we plan to >> deploy a new mail system. I need to know the names of some medium to large >> ISPs that uses Postfix as their SMTP server. Do you know where I can find >> that information?
> It may be worth noting that the open source Zimbra integrated messaging > suite uses Postfix as its MTA component. > > Some noteworthy Postfix using sites in the USA: > > 1. Stanford University's 4 MX hosts run Postfix > http://www.stanford.edu > One of the leading research universities in US > Cisco Systems powers the internet and was born at Stanford: > http://www.stanford.edu/group/wellspring/cisco_spotlight.html > Current enrollment 19,535 > Graduate students 12,595 > mx2.stanford.edu. 1800 IN A 171.67.219.72 > mx3.stanford.edu. 1800 IN A 171.67.219.73 > mx4.stanford.edu. 1800 IN A 171.67.219.74 > mx1.stanford.edu. 1800 IN A 171.67.219.71 > > 2. NASA's 6 MX hosts run Postfix > http://www.nasa.gov > ndmsnpf02.ndc.nasa.gov. 600 IN A 198.117.0.122 > ndjsnpf03.ndc.nasa.gov. 600 IN A 198.117.1.123 > ndjsnpf01.ndc.nasa.gov. 600 IN A 198.117.1.121 > ndmsnpf03.ndc.nasa.gov. 600 IN A 198.117.0.123 > ndmsnpf01.ndc.nasa.gov. 600 IN A 198.117.0.121 > ndjsnpf02.ndc.nasa.gov. 600 IN A 198.117.1.122 Some additions: 3. United States Navy. The US Navy currently has ~333,000 personnel. 3 MX hosts for navy.mil all running Postfix mx13.nmci.navy.mil. 600 IN A 138.162.5.133 mx15.nmci.navy.mil. 600 IN A 138.163.129.68 mx14.nmci.navy.mil. 600 IN A 138.163.1.68 4. Embarq and CenturylTel merged to become CenturyLink. In 2008 they had a combined 2 million subscribers. Synacor provides all customer email services and uses the eCelerity MTA, which is based on Postfix. Today CenturyLink is likely the 10th largest US ISP based on subscriber count. mailrelay.embarq.synacor.com. 300 IN A 208.47.184.3 5. Windstream.net, 12th largest US ISP, 1 million subscribers in 2008 mx01.windstream.net. 900 IN A 162.39.147.49 6. MessageLabs. According to this press release: http://tinyurl.com/6gxbpfw MessageLabs was running eCelerity across 1300 servers in 2006 eCelerity is now a Message Systems, Inc concern embedded within their Message Central product. cluster6a.eu.messagelabs.com. 900 IN A 193.109.254.3 cluster6a.eu.messagelabs.com. 900 IN A 85.158.136.67 cluster6.eu.messagelabs.com. 900 IN A 85.158.136.67 cluster6a.eu.messagelabs.com. 900 IN A 85.158.136.83 cluster6.eu.messagelabs.com. 900 IN A 195.245.230.51 cluster6.eu.messagelabs.com. 900 IN A 193.109.254.3 cluster6a.eu.messagelabs.com. 900 IN A 195.245.230.83 cluster6.eu.messagelabs.com. 900 IN A 85.158.136.51 cluster6a.eu.messagelabs.com. 900 IN A 85.158.136.51 cluster6.eu.messagelabs.com. 900 IN A 195.245.230.83 cluster6a.eu.messagelabs.com. 900 IN A 195.245.231.196 cluster6.eu.messagelabs.com. 900 IN A 85.158.136.83 In this case it appears they've replaced the 500 5.5.2 unrecognized command error with with a custom message: 214 See http://www.messagelabs.com/support Some of the Synacor systems do this as well, while others have the standard Postfix return message. Viktor how much email does MessageLabs handle? I know it's big but I have no direct knowledge of their numbers. -- Stan
