We have been having a problem emailing to a customer whose server is hosted by 
The Planet (http://www.theplanet.com/). Our mail server is hosted in-house on a 
comcast business connection.

IP address of our server is: 173.13.45.23

Customers mail server is: 69.93.203.243

I cannot telnet to port 25 on their server, and they cannot telnet to port 25 
on ours.

If I try to connect to their mail server from a different network such as my 
home internet connection, I can connect.
We do not do any firewalling that would block this in anyway. We were able to 
send and receive email to them when we used Qwest for our connection, before we 
switched to Comcast.

Comcast has said the problem is not on their end because it times out at The 
Planet.
The Planet doesn't have much interest in speaking with me, because I'm not 
their customer.

Not sure what to do at this point.

Below is a traceroute:
traceroute to 69.93.203.243 (69.93.203.243), 64 hops max, 52 byte packets
 1  223.254.254.75 (223.254.254.75)  2.610 ms  2.057 ms  2.033 ms
 2  173-13-45-30-pennsylvania.hfc.comcastbusiness.net (173.13.45.30)  3.656 ms  
2.997 ms  3.119 ms
 3  * * *
 4  68.85.72.129 (68.85.72.129)  10.497 ms  9.624 ms  12.245 ms
 5  te-9-1-ur02.greensburg.pa.pitt.comcast.net (68.86.100.53)  9.935 ms  10.049 
ms  10.505 ms
 6  te-3-2-ar01.mckeesport.pa.pitt.comcast.net (68.86.100.49)  14.795 ms  
12.846 ms  14.006 ms
 7  te-0-4-0-5-cr01.mclean.va.ibone.comcast.net (68.86.91.129)  17.868 ms  
16.278 ms  21.110 ms
 8  pos-1-10-0-0-cr01.atlanta.ga.ibone.comcast.net (68.86.86.126)  43.022 ms  
40.690 ms  39.818 ms
 9  pos-1-15-0-0-cr01.dallas.tx.ibone.comcast.net (68.86.85.149)  58.980 ms  
58.914 ms  59.673 ms
10  pos-0-0-0-0-pe01.1950stemmons.tx.ibone.comcast.net (68.86.86.90)  59.608 ms 
 60.322 ms  59.691 ms
11  theplanet-cr01.dallas.tx.ibone.comcast.net (75.149.228.2)  62.246 ms  
61.320 ms  61.693 ms
12  te3-5.dsr01.dllstx3.theplanet.com (70.87.253.86)  61.431 ms
    te7-1.dsr02.dllstx3.theplanet.com (70.87.253.18)  58.859 ms  59.365 ms
13  76.fd.5746.static.theplanet.com (70.87.253.118)  62.690 ms
    te1-3.dsr02.dllstx2.theplanet.com (70.87.253.122)  68.123 ms
    te3-3.dsr02.dllstx2.theplanet.com (70.87.253.126)  59.382 ms
14  po1.car02.dllstx2.theplanet.com (70.87.254.82)  59.321 ms  60.268 ms  
66.206 ms
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *
31  * * *
32  * * *
33  * * *
34  * * *
35  * *^C


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