John W. Colby
jwcolby at colbyconsulting.com
Sat Jul 30 23:43:27 CDT 2005
Does anyone understand what is going on with email sent from inside of
specific networks. Here's the situation...
I get the following error (as an example):
Your message did not reach some or all of the intended recipients.
Subject: RE: Logging in to George
Sent: 7/29/2005 1:00 PM
The following recipient(s) could not be reached:
'Jason Ralph' on 7/29/2005 1:00 PM
550 not local host invohealthcare.com, not a gateway
>From my sister-in-law's house when I try to send to this specific address,
using SMPT server mail.colbyconsulting.com. If I send mail to myself I do
not get this problem (to jwcolby at colbyconsulting.com). I have seen this
exact same symptom if sending from my client. It never happened before from
my sister-in-law's but is now.
It turns out that if I look at her email smtp server
(mail.rochester.rr.com), and modify my smtp server to match it works. It
appears that this is the classic port 25 blocking thing. It is a royal PITA
to have to find out what the correct smtp server is, modify Outlook, and
send to that whenever I move from place to place.
At my previous host for MY WEB SITE, they had me set up to send on a
different port (26 maybe?) and then it worked regardless of where I was
since only port 25 was being blocked and my web email server
(mail.colbyconsulting.com) was expecting traffic on a different port.
The odd part here is that I can send to myself (always), i.e.
jwcolby at colbyconsulting.com. That must go on port 25 as well, so why does
that go just fine, but not the other message?
John W. Colby
www.ColbyConsulting.com
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