Undeliverable E-mails

[SOC]

In the past few days I have been unable to send e-mails to various trusted
addresses, I am using Outlook 2007. The e-mails bounce back to my inbox with
the following message: 553 sorry, that domain isn't in my list of allowed
rcpthosts (#5.7.1) Your message did not reach some or all of the intended
recipients.

 

[VanguardLH]

In the past few days I have been unable to send e-mails to various
trusted
addresses, I am using Outlook 2007. The e-mails bounce back to my
inbox with
the following message: 553 sorry, that domain isn't in my list of
allowed
rcpthosts (#5.7.1) Your message did not reach some or all of the
intended
recipients.

EVERY recipient to whom you send e-mail is a trusted address. It
really makes no sense saying that a recipient is a "trusted address".
Either you are going to send e-mail to them or you aren't.

Are you using the SMTP mail host on the same network to which you
connect? That is, are you using an on-domain SMTP server? Some ISPs
demand that you use their SMTP server to originate your outbound
e-mails. This is an anti-spam measure.

Are you trying to connect to an off-domain SMTP mail host? That is,
are you trying to use an SMTP server that is *not* on the network to
which YOU are connected? Some e-mail providers demand that you be on
their network to connect to the SMTP mail host (just like above) or
that you authenticate to their SMTP mail host to prove that you have
permission to use their resources. You are coming from off their
domain so they have no way to know that you are authorized to use
their mail resources.

Configure the e-mail account in Outlook to authenticate to whatever
SMTP mail host you are trying to use. If that doesn't work, and if it
is an off-domain mail host (from the network to which you connect),
see if that e-mail provider lets you specify a port other than 25 for
connecting to their mail host. If you are connecting to an off-domain
mail host, the owner of that mail host might also require you use
additional security measures to connect to their property than just
authentication, like using SSL and SPA. Check with the owner of the
SMTP mail host to which you connect to find out what ports are used
for connections and if SSL and SPA are also required.

For info on off-domain port 25 (SMTP) traffic blocked to thwart spam
from spammers or infected customers, read:

http://www.commercestreet.com/Blocking_Port_25.htm
http://help.yahoo.com/help/us/mail/pop/pop-38.html

http://www.postcastserver.com/help/Port_25_Blocking.aspx
http://www.aota.net/Troubleshooting/port25.php4

http://www.google.com/search?q=+block++"port+25"++SMTP++spam

 

[SOC]

Thank you very much for your help. The problem was that I changed ISP a few
months back but they only deactivated it a few days ago.

 

[VanguardLH]

in message

Thank you very much for your help. The problem was that I changed
ISP a few
months back but they only deactivated it a few days ago.

You expected a paid service to continue giving you that service for
free? I'm surprised they didn't kill your account within a week of
you telling them that you were closing the account.

 

[Rich/rerat]

VanguardLH,
The OP never stated that she canceled her former service, her service could
have changed because another cable service bought up/took over her service,
from her previous ISP. And there was a transition period where her old email
accts would continue working, with her old settings. Or her old service gave
her a "Grace Period" to move her email, while her new ISP, allowed Port:25
access, so she could still connect to her old email servers. The new ISP may
have recently started blocking PORT:25 access. so she could no longer access
the old outgoing mail server.

Comcast merged Detroit and Ann Arbor, MI service areas for cable and
internet back several years ago, and my ISP and Email accts still had
settings for MediaOne, until the change was complete, since they did a
section/town at a time in the region, took almost a year. While this
transition was going on if I wanted to create a new email acct, it would
have had a (e-mail address removed) address, and use Comcast.net POP mail server
settings. So I had MediaOne & Comcast email accts set up in my email
application. while connected to Comcast Internet service.

--
Add MS to your News Reader: news://msnews.microsoft.com
Rich/rerat
(RRR News) <message rule>
<<Previous Text Snipped to Save Bandwidth When Appropriate>>


in message

Thank you very much for your help. The problem was that I changed
ISP a few
months back but they only deactivated it a few days ago.

You expected a paid service to continue giving you that service for
free? I'm surprised they didn't kill your account within a week of
you telling them that you were closing the account.