Cannot send mail - "533 sorry, that domain isn't in my allowed list of rcp hosts

Hi

 I use my laptop at my office and at home, and send Outlook mails from it. I have seperate mail accounts for this, so that I use different SMTP servers. I've been sending mails like this for years. Anyway, tonight, suddenly, I couldn't do it. Everytime I try, the mail bounces back with the following error:

Could not deliver to the follow recipient...

'name@domain.com' 01-12-2007 12:59
            553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)

I've never come across this time of error before. Anyone know what to do?
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Jason210Asked:
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brasslanConnect With a Mentor Commented:
The 553 error that you are getting is coming from the mail server that you are sending the mail through.  The admin for that mail server probably made a change to the server to tighten security, or reduce spam or something like that.

If you are not currently using authentication to send your e-mail, you should try turning that on, as that may allow you to once again relay (send) mail through that smtp server.  You can also contact the ISP that manages that mail server to see what they have to say about it.

-Brasslan
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war1Commented:
Hello Jason210,

I assume you have sent to this address before and it is a known good address.

Your POP mail client is not working correctly. Use port 587 with SMTP authentication.

If no joy, delete and recreate a new account in you email client.

Hope this helps!
war1
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Jason210Author Commented:
Hi war1

None of the addresses I send to work.

I'll see if what you say works.
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Jason210Author Commented:
I recreated the account and the problem perists. I did notice now that there is a delay before the mail bounces back, indicating that it's actually going to the server, and then coming back.

How does authentication work? What do I need to do?
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Jason210Author Commented:
Hmmm - I'm puzzled and concerned about this. What is it that the admin has done to the server? Have they blocked mail forwarding or something like that?
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war1Commented:
Jason210,

The problem could be with the recipient's server, so check with your recipient to see if they are blocking your domain.

The problem could be with yoru ISP.  Check if they have changed anything.  They may be blocking all SMTP servers other than its own.
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brasslanCommented:
When e-mails are sent from outlook to an SMTP server, there is no authentication that occurs between you and the mail server.  It just looks at your IP address, and the e-mail address that you are sending mail to.  

If your mail server allows you to send e-mail from your IP address then no authentication is needed.  But mail administrators are having to put more safeguards in place to prevent spammers from doing their thing.  When you enable authentication, then outlook will login to the mail server with your e-mail address and password before you are allowed to send the e-mail.

Inside of your Outlook e-mail account, you can click on 'More Settings', or 'Other Settings' to find SMTP or Outgoing Authentication.
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Jason210Author Commented:
Ok tried it but it said that the server didn't support this kind of authentication....
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war1Commented:
Jason210,

I suggested in my first post, "Use port 587 with SMTP authentication".  You said you tried authentication already.
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brasslanCommented:
Definitely sounds like something that you should contact your ISP about.  Especially if you have not made any changes, installed or uninstalled any software, when the problem occurred.  I still think they changed something on their side.
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war1Commented:
Jason210,

1. Register an important send/receive library file.  Go to Start > Run and type regsvr32 inetcomm.dll

2. Check if antivirus email check is slowing sending and receiving.  Disable it. Check if other programs running in the background is interfering. Disable one at a time the Firewall, antispyware, antispam, and all Norton programs.

3. In the account settings, Advanced settings, change the server timeout time from 1 min to 5 min

4. If no joy, you need to use your ISP SMTP server to send out emails.

5. Create a new Outlook profile.
http://www.outlook-tips.net/howto/profile.htm

6.  Check with email provider Tech Support to determine if server is having trouble.
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Jason210Author Commented:
War1, from what I gather this is an SMTP problem not a POP server problem. POP server's require authentification.

I couldn't find the setting to specify port 587 though. I found the settings Brasslan referred to "click on 'More Settings', or 'Other Settings' to find..."

There I was given a choice to specify my own name and password, or use those of the pop server. I chose the latter, and when I tried to send the mail, it said this kind of thing wasn't supported...
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Jason210Author Commented:
I think I need to ring my ISP tomorrow. I wish they'd inform people about these kind of changes before implementing them.
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war1Commented:
Jason210,

The setting is a outgoing server authentication.  It is a SMTP server authentication.  You use same setting as incoming server login. (POP3 password server authentication is something else.)

Are you sending via SMTP server other than that of your ISP?  If so, use your ISP SMTP server settings.

A setting may be stuck.  Delete and Recreate the POP3/SMTP account.
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prolixaliasConnect With a Mentor Commented:
It's an SMTP "relay" issue.... Please see this similar EE thread:

http://www.experts-exchange.com/Programming/Languages/C_Sharp/Q_21643942.html?qid=21643942

You'll find the discussion there handy for talking to the admin of that mail host you're trying to relay through.

:)
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Jason210Author Commented:
The ISP did stopped relaying mail.
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