On Sun, 2011-07-17 at 23:15 +0200, Alexander Dalloz wrote:
The 2nd one in your list:
Organisation: British Telecommunications, EU HELO / EHLO: smtpe1.intersmtp.com HELO IP: 62.239.224.89 MX IP: 62.239.224.234 MX DNS A record: smtp61.intersmtp.com
Here smtpe1.intersmtp.com resolves properly forward and reverse, if that is what counts for you.
BUT the IP address used for the mail server was, as the list shows, 62.239.224.234 which, at the time, had a host name of smtp61.intersmtp.com
smtpe1.intersmtp.com still does NOT properly resolve.
host smtpe1.intersmtp.com smtpe1.intersmtp.com has address 62.239.224.89
host 62.239.224.89 89.224.239.62.in-addr.arpa domain name pointer smtpe1.intersmtp.COM.
*almost* correct. In Linux, like Unix and the pre-Microsoft days, uppercase letters have a different numerical value to lowercase letters.
Uppercase 'COM' is definitely not the same as lowercase 'com'.
No wonder some call 'BT' Balls-up Telecoms.
Do your Mail Transfer Agents use valid or bogus HELO/EHLO names ?