Re: Unable to send mail from PHP to AT&T e-mail address

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2009/4/22 Edward Diener <eldml@xxxxxxxxxxxxxx>:
> scubak1w1 wrote:
>>
>> "Edward Diener" <eldml@xxxxxxxxxxxxxx> wrote in message
>> news:D9.64.21597.C829EE94@xxxxxxxxxxxxxxx
>>>
>>> Chris wrote:
>>>>
>>>> kranthi wrote:
>>>>>
>>>>> of u are sure that the mail was not received as spam...
>>>>>
>>>>> check the log files of the mail server on the server to be sure that
>>>>> the mail actually reached the mail server from the http server
>>>>
>>>> Somehow I doubt AT&T gives out that sort of access ;)
>>>
>>> Exactly.
>>>
>>>> The idea is right if you have access to both servers though.
>>>
>>> As you suggested, I can check my own server but I doubt I can get access
>>> to AT&T's incoming mail server.
>>
>> AT&T is potentially using one of the BLs such as SCBLs...
>>
>> Try going to, say, http://www.senderbase.org/, enter the IP and then on
>> the listings page try the DNS-based blocklists [Show/Hide all] links
>
> I pinged the domain part of the 'from' email for the sending server and got
> back an IP address. I entered that IP address at http://www.senderbase.org/
> and received a 'Neutral' reputation score with 'no information' found from
> whois and 'unknown' found for information about the network.
>
> I am not sure what final IP address the mail server is using to send out
> e-mail but 7 addresses starting with the first 3 parts of the IP were listed
> as addresses and all showed 0 DNSBL listings and 'Neutral' SBRS. Needless to
> say no spam is being sent from the mail addresses, since it is used by the
> server as part of a legitimate client-server program.
>
> Also bl.spamcop.net shows nothing for the IP address.
>
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>

What output do you get from ...

nslookup -q=mx put_the_domain_here.com

e.g.

nslookup -q=mx google.com

Server:  bv-vm-svr-1.[srcubbed].local
Address:  10.0.30.1

google.com      MX preference = 10, mail exchanger = smtp3.google.com
google.com      MX preference = 10, mail exchanger = smtp4.google.com
google.com      MX preference = 10, mail exchanger = smtp1.google.com
google.com      MX preference = 10, mail exchanger = smtp2.google.com
google.com      nameserver = ns3.google.com
google.com      nameserver = ns1.google.com
google.com      nameserver = ns4.google.com
google.com      nameserver = ns2.google.com
smtp1.google.com        internet address = 209.85.237.25
smtp2.google.com        internet address = 64.233.165.25
smtp3.google.com        internet address = 209.85.137.25
smtp4.google.com        internet address = 72.14.221.25
ns1.google.com  internet address = 216.239.32.10
ns2.google.com  internet address = 216.239.34.10
ns3.google.com  internet address = 216.239.36.10
ns4.google.com  internet address = 216.239.38.10

As you can see there are MANY servers set up to receive SMTP mail for google.com

None of them are the same as the IP you see when you ...

ping google.com

Pinging google.com [74.125.45.100] with 32 bytes of data:

Reply from 74.125.45.100: bytes=32 time=104ms TTL=239
Reply from 74.125.45.100: bytes=32 time=103ms TTL=239
Reply from 74.125.45.100: bytes=32 time=105ms TTL=239
Reply from 74.125.45.100: bytes=32 time=104ms TTL=239

Ping statistics for 74.125.45.100:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 103ms, Maximum = 105ms, Average = 104ms



-- 
-----
Richard Quadling
Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
"Standing on the shoulders of some very clever giants!"

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