nanog mailing list archives
Re: Outgoing SMTP Servers
From: Bjørn Mork <bjorn () mork no>
Date: Tue, 25 Oct 2011 14:43:56 +0200
Owen DeLong <owen () delong com> writes:
It's both unacceptable in my opinion and common. There are even those misguided souls that will tell you it is best practice, though general agreement, even among them seems to be that only 25/tcp should be blocked and that 465 and 587 should not be blocked.
It is definitely considered best practice in some areas. See e.g. http://translate.google.com/translate?hl=en&u=http://ikt-norge.no/wp-content/uploads/2010/10/bransjenorm-SPAM.pdf (couldn't find an english original, but the google translation looks OK) The document is signed by all major ISPs in Norway as well as the Norwegian research and education network operator, so it must be considered a local "best practice" whether you like it or not. Note that only port 25/tcp is blocked and that some of the ISPs offer a per-subscriber optout. Eh, this was the Northern Aurope NOG, wasn't it? Bjørn
Current thread:
- Outgoing SMTP Servers Dennis Burgess (Oct 24)
- Re: Outgoing SMTP Servers Owen DeLong (Oct 24)
- RE: Outgoing SMTP Servers Dennis Burgess (Oct 24)
- Re: Outgoing SMTP Servers Bjørn Mork (Oct 25)
- Re: Outgoing SMTP Servers Carlos Martinez-Cagnazzo (Oct 25)
- RE: Outgoing SMTP Servers Dennis Burgess (Oct 25)
- Re: Outgoing SMTP Servers David E. Smith (Oct 25)
- Re: Outgoing SMTP Servers Carlos Martinez-Cagnazzo (Oct 26)
- Re: Outgoing SMTP Servers Randy Bush (Oct 25)
- Re: Outgoing SMTP Servers Owen DeLong (Oct 24)
- Re: Outgoing SMTP Servers Jeroen van Aart (Oct 25)
- RE: Outgoing SMTP Servers John van Oppen (Oct 26)
- RE: Outgoing SMTP Servers up (Oct 26)
- Re: Outgoing SMTP Servers Owen DeLong (Oct 25)