Telecoms IP's blacklisted

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mattwnz

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Topic # 114928 7-Mar-2013 18:06

Anyone else having trouble with telecoms IP's being blacklisted. I have had a few clients contact me over the last few days saying that emails that they are sending via a third party webmail are getting identified as spam, and not reaching their destination. My webmail provider has told me that telecoms IPs have been blacklisted and there is no reverse DNS on the IP, which is the cause of the problem. They gave me a link to mxtoolbox.com/ with the IP, and indeed it is blacklisted with BARRACUDA , Spamhaus-ZEN

Had another who was usiing telstra, and they too are having the identical. So what is the process for these people to get themselves off this blacklist? Or does the ISp do this automatically, or do they have staff monitoring their IP's for blacklistings. I presume they are getting blacklisted because some of the customers have compromised computers, and are sending out spam, but wonder how stircly this gets monitored?

freitasm

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Reply # 776376 7-Mar-2013 18:11

Telecom's IP addresses or the Yahoo! SMTP IP address?

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johnr

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Reply # 776387 7-Mar-2013 18:26

Could be related to a lot of SPAM been sent recently!

mattwnz

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Reply # 776395 7-Mar-2013 18:54

freitasm: Telecom's IP addresses or the Yahoo! SMTP IP address?

It appears to be telecoms actual IP's that the user connects to the internet with , eg one of them begins with 219.89.243.###

Not sure if it related to the xtra / yahoo problems but anythings possible

plambrechtsen

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Reply # 776401 7-Mar-2013 19:08

Feel free to email me pl @ telecom.co.nz and I can look into it.

I think whole dialup ranges are blocked. But I don't think we offer reverse DNS on residential connections.

mattwnz

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Reply # 776520 7-Mar-2013 22:10

plambrechtsen: Feel free to email me pl @ telecom.co.nz and I can look into it.

I think whole dialup ranges are blocked. But I don't think we offer reverse DNS on residential connections.

Thanks, I will email you the IP's. Although just testing a random IP number after the 219.89.243, such as 219.89.243.111 , that is also blacklisted, so it looks to be at least the 219.89.243.001 - 219.89.243.999 range

MackinNZ

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Reply # 776541 7-Mar-2013 22:51

Yet another good reason for not using ISP e-mail. IMO no business should be using ISP e-mail.

Register your own domain and use a reliable e-mail provider. Office 365, Google Apps, etc. etc.

Kyanar

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Reply # 776543 7-Mar-2013 22:59

MackinNZ: Yet another good reason for not using ISP e-mail. IMO no business should be using ISP e-mail.

Register your own domain and use a reliable e-mail provider. Office 365, Google Apps, etc. etc.

This is nothing to do with ISP email. This is to do with the customer running their own mail server and it being blacklisted by the lists. Probably listed in DUL and similar as "use the ISP SMTP server".

mattwnz

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Reply # 776570 8-Mar-2013 00:38

Kyanar:
MackinNZ: Yet another good reason for not using ISP e-mail. IMO no business should be using ISP e-mail.

Register your own domain and use a reliable e-mail provider. Office 365, Google Apps, etc. etc.

This is nothing to do with ISP email. This is to do with the customer running their own mail server and it being blacklisted by the lists. Probably listed in DUL and similar as "use the ISP SMTP server".

Partly correct. They are using a web hosts webmail system, and the webmail records the computers IP address, as the 'originating IP' in the email header when it sends the email. So if the computer IP address (their ISPs IP address) is blacklisted, then it will be detected by the webmail system as having a higher likelyhood as being spam. I suspect it could occur with any webmail system. But my client is using the Atmail system, and senting with their own domain name. The actual email is getting sent via teh email hosts IP, which isn't blacklisted. It is only the originating IP (the ISPs IP) that is blacklisted.