RE: [IMail Forum] ISP's blocking port 25 except to their own mail servers

Mon, 28 Feb 2005 14:09:53 -0800

Title: Message
I Had the same question toward my old ISP (SBC-Yuchoo) and IMHO they don't know how.
 
~Rick
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Matrosity Tech Support
Sent: Monday, February 28, 2005 3:58 PM
To: [email protected]
Subject: Re: [IMail Forum] ISP's blocking port 25 except to their own mail servers

Just curious, why not let your clients send email throught their own ISP's? This save you bandwidth, processing, etc...

Matt Robertson wrote: 
A. Clausen wrote:
  
If we start seeing dopes leaving 587 as an open
relay, then yes, perhaps someday those dopes will screw it for the rest of
us.
    

Thats exactly what I was alluding to.

I will say that all of my dsl customers have had zero trouble with
2525.  However one lone customer on dialup had it work, but then 24
hours later it was blocked.  Not too surprising as to why.  If I face
something similar it won't take much to switch everyone over to Port
587.  The switch to 2525 was surprisingly smooth when the port 25
blocks cascaded down in the last few weeks.  But again I wonder if
SBC, Comcast et al in their collective wisdom won't block it anyway;
treating it as a control issue and forcing use of their own servers.

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