CellC SMTP [solved]

ping mail.cmobile.co.za

Pinging mta0.cmobile.co.za [196.38.218.30] with 32 bytes of data:
Request timed out.
Request timed out.

Ping statistics for 196.38.218.30:
Packets: Sent = 2, Received = 0, Lost = 2 (100% loss),
 
Maybe there was a problem yesterday telnet this morning is connecting fine. Retry and post if your still having a problem
 
Why do you have to use mail.cmobile.co.za to relay email? I can connect to port 25 directly on my email server from Cell C 3G. Port 25 doesn't seem to be blocked for me.
 
marlboro said:
Why do you have to use mail.cmobile.co.za to relay email? I can connect to port 25 directly on my email server from Cell C 3G. Port 25 doesn't seem to be blocked for me.
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You don't have to use mail.cmobile.co.za, it's there for all those who don't have their own mail servers, or whose mail servers don't accept connections from other networks.
 
daveza said:
Nope.

Why would one not be able to ping or Telnet if you aren't coming from the Cell C network ?
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ISPs will only accept SMTP connections from IPs that fall inside their client range, otherwise they will be classed as an open relay for spamming. So if you are using Telkom ADSL you need to relay via them. Only if you are connected on CellC can you relay through mail.cmobile.co.za.
 
morkhans said:
ISPs will only accept SMTP connections from IPs that fall inside their client range, otherwise they will be classed as an open relay for spamming. So if you are using Telkom ADSL you need to relay via them. Only if you are connected on CellC can you relay through mail.cmobile.co.za.
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Sorry but that is wrong. Ever heard of SMTP AUTH? The difference is with Cell C port 25 is open to anywhere and I don't see a reason from a client to relay though mail.cmobile.co.za unlike iBurst where you are forced to use their relay. The only case you'll want to use mail.cmobile.co.za is if you are having email server connected through Cell C and you don't want your emails to appear as coming from dynamic range.
 
marlboro said:
Sorry but that is wrong. Ever heard of SMTP AUTH? The difference is with Cell C port 25 is open to anywhere and I don't see a reason from a client to relay though mail.cmobile.co.za unlike iBurst where you are forced to use their relay. The only case you'll want to use mail.cmobile.co.za is if you are having email server connected through Cell C and you don't want your emails to appear as coming from dynamic range.
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Yes I have heard of SMTP Auth. :rolleyes:

My reply is meant to be read in the context of the problem the user is experiencing. He's connected to another ISP and then trying to relay his mail via CellC (without authentication), that's never going to work.
 
I have found that I cannot ping mail.cmobile.co.za when my modem is plugged into my router, but when I plug it into my PC, it works fine... I assume it is the firewall on the router, will have to start playing and investigating when I have some time. So if anyone else experiences the same, that might be a good place to start looking!
 
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