nanog mailing list archives

Re: ISP port blocking practice


From: JC Dill <jcdill.lists () gmail com>
Date: Fri, 03 Sep 2010 07:38:31 -0700

Patrick W. Gilmore wrote:
On Sep 3, 2010, at 8:22 AM, Owen DeLong wrote:
On Sep 2, 2010, at 10:41 PM, Franck Martin wrote:

Have you heard of the submission port?

Yes... Many of the idiots that block outbound 25 also block outbound 587 and sometimes 465.

Could you point to more than one instance?  I've not yet found one.  And I think I spend at least as much time in hotels & 3G 
& airports & etc. as you anyone else here.

FWIW, I had it happen at a local library. Used their webform to send a message mentioning that blocking 25 was good, but blocking 587 and 465 was bad. It took several days but they did fix it.

jc



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