nanog mailing list archives
Re: ISP port blocking practice
From: "Lyndon Nerenberg (VE6BBM/VE7TFX)" <lyndon () orthanc ca>
Date: Thu, 22 Oct 2009 17:14:11 -0600
Few companies use the MSP port (tcp/587).
Can you elaborate. Is this based on analysis you've conducted on your own network? And if so, is the data (anonymized) available for the rest of us to look at? My experience is that port 587 isn't used because ISPs block it out-of-hand. Or in the case of Rogers in (at least) Vancouver, hijack it with a proxy that filters out the AUTH parts of the EHLO response, making the whole point of using the submission service ... pointless. --lyndon
Current thread:
- ISP port blocking practice Zhiyun Qian (Oct 22)
- Re: ISP port blocking practice Antonio Querubin (Oct 22)
- Re: ISP port blocking practice Valdis . Kletnieks (Oct 22)
- Re: ISP port blocking practice Ricky Beam (Oct 22)
- Re: ISP port blocking practice Justin Shore (Oct 22)
- Re: ISP port blocking practice Lyndon Nerenberg (VE6BBM/VE7TFX) (Oct 22)
- Re: ISP port blocking practice Sean Donelan (Oct 22)
- Re: ISP port blocking practice Joe Maimon (Oct 22)
- Re: ISP port blocking practice Steve Bertrand (Oct 22)
- Re: ISP port blocking practice Lyndon Nerenberg (VE6BBM/VE7TFX) (Oct 23)
- Re: ISP port blocking practice Chris Boyd (Oct 23)
- Re: ISP port blocking practice Lyndon Nerenberg (VE6BBM/VE7TFX) (Oct 22)
- Re: ISP port blocking practice Justin Shore (Oct 22)
- Re: ISP port blocking practice Joe Maimon (Oct 22)
- Re: ISP port blocking practice Justin Shore (Oct 22)
- Re: ISP port blocking practice Scott Howard (Oct 22)
- Re: ISP port blocking practice Owen DeLong (Oct 22)