nanog mailing list archives
Re: Outgoing SMTP Servers
From: Owen DeLong <owen () delong com>
Date: Tue, 25 Oct 2011 17:15:26 -0700
On Oct 25, 2011, at 3:16 PM, William Herrin wrote:
On Tue, Oct 25, 2011 at 5:56 PM, Owen DeLong <owen () delong com> wrote:Put another way, your mechanism rewards those doing the wrong thing while punishing those of us sending our email via encrypted and authenticated mechanisms.Owen, If you're doing the "right" thing, sending email via encrypted, authenticated mechanisms, then you're doing it TCP ports 587 or 443. Where Mike's mechanism obstructs you not at all.
Depends. Some hotel admins aren't so bright. That's the problem. Not everyone hears block outbound SMTP on port 25, they hear block outbound SMTP and stop listening. Boom, 25, 465, 587 all get turned off. Worse, if they redirect 25, then, it can still cause problems with many clients because they will try 25 first assuming that if it is broken it will fail. There''s nothing wrong with that approach IMHO. There's no reason one can't send email over 25 just as well as 587 as long as they're authenticating and doing it over an encrypted channel. My client generally tries in this order: 25, 587, 465, 443, 80. If people merely break things by blocking SMTP on one or more ports, then it works. If they do stupid pet tricks like redirecting all connections to other addresses to their own server, then it breaks horribly.
If you're still doing the wrong thing, trying to talk to remote SMTP servers on TCP port 25, why should his mechanisms not punish you?
It's not wrong to talk to them on port 25. It's wrong to allow unauthenticated remote users to send on your own port 25 for relay purposes. This is the problem... I don't buy your idea of what constitutes doing the wrong thing and neither do the developers of many email clients. Owen
Current thread:
- Re: Outgoing SMTP Servers, (continued)
- Re: Outgoing SMTP Servers Jeroen Massar (Oct 25)
- Re: Outgoing SMTP Servers Owen DeLong (Oct 25)
- Re: Outgoing SMTP Servers Jeroen Massar (Oct 25)
- Re: Outgoing SMTP Servers Owen DeLong (Oct 25)
- Re: Outgoing SMTP Servers Ricky Beam (Oct 25)
- Re: Outgoing SMTP Servers Alex Harrowell (Oct 25)
- Re: Outgoing SMTP Servers Robert Bonomi (Oct 25)
- Re: Outgoing SMTP Servers Mike Jones (Oct 25)
- Re: Outgoing SMTP Servers Owen DeLong (Oct 25)
- Re: Outgoing SMTP Servers William Herrin (Oct 25)
- Re: Outgoing SMTP Servers Owen DeLong (Oct 25)
- Re: Outgoing SMTP Servers William Herrin (Oct 25)
- Re: Outgoing SMTP Servers Owen DeLong (Oct 25)
- Re: Outgoing SMTP Servers Mike Jones (Oct 25)
- Re: Outgoing SMTP Servers Owen DeLong (Oct 26)
- Re: Outgoing SMTP Servers Henry Yen (Oct 26)
- Re: Outgoing SMTP Servers Graham Beneke (Oct 25)
- Re: Outgoing SMTP Servers Ricky Beam (Oct 26)
- Re: Outgoing SMTP Servers Mark Andrews (Oct 26)
- Re: Outgoing SMTP Servers Leigh Porter (Oct 26)
- Re: Outgoing SMTP Servers Mark Foster (Oct 26)