Server error 3204

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See if steps 1 & 2 help you...
http://answers.microsoft.com/en-us/windowslive/forum/livemail-email/how-can-i-solve-synchronization-send-and-receive/dee0c2d9-998c-472e-aac9-0374c082854b

If you are trying to send or receive an email in Microsoft Outlook and the password doesn't work, you can check a number of different things. Microsoft Outlook validates your email account with your email provider using various settings. Once it has validated your settings, it will send or receive email. It is not only useful to set up your email correctly but essential if you wish to use Microsoft Outlook.

Gather all of the email settings for your email account. These will be located on your email provider's website in an FAQ or support section. If in doubt contact your email provider to provide all of the settings. Look for any of the following terms: POP, SMTP, IMAP, SSL, SPA, server, and port number. Make a note of all of these. Determine when the problem exists. Check if the problem occurs when sending an email, receiving an email, or both. If the password error only happens with either sending or receiving, this narrows down the source of the problem. Click "Start," type "Outlook" and press "Enter" to open Microsoft Outlook. Click "File > Info > Account Settings." Select your email account and click "Change." Click the "Incoming mail server" field, if your error was when receiving email but not sending. Enter the full "incoming mail server" address as provided by your email provider. If your email is "IMAP" then change the "Account Type" to display "IMAP." Click "More Settings > Advanced." Make sure that the incoming server "Port" number is the same as your email provider stipulates. If your provider requires SSL, then click "This server requires an encrypted connection (SSL)." Click "OK." Click the "Outgoing mail server" field, if your error was when sending email. Enter the full outgoing server address. Click "More Settings > Advanced." Make sure the "Outgoing server" port is correctly set. If your email provider requires encryption, then select the correct type from the drop-down menu. Click "OK." Click the "password" field and make sure you have entered the correct password. If your mail provider requires "SPA," then click the "Require logon using Secure Password Authentication (SPA)" to enable it. Click "Next" and then "Finish." Your password should now work. Hope it helps.

Check for a typo in the SMTP server address. You might also try smtp.googlemail.com instead (port 465 SSL). I've seen both used.

Try to turn off the email scanning of your Antivirus.
You may have to change the email server information over to the one that is in Belgium. Looks like your computer is still trying to use the one from Schweiz.

Typically this error indicates that you are trying to send your Adhost email through Adhost’s mail server when you have not authenticated your email account to send mail. Our mail server authenticates you through your pop account. So when you check your email, our mail server authenticates your pop user and password, captures that IP that you are checking your email from, and adds that IP to our relay list. This list is flushed every 70 minutes. This means, if you try to send email after the relay list has been flushed and before you’ve attempted to check your email, you will receive this error.


How to fix the problem:

Fix #1 - reauthenticate on our server.

Remove any email from your Outbox. If you need to keep the message, you can move it to your 'Drafts' folder.
Click "Send/Receive". This will reauthenticate you.
Try resending the email.
Fix #2 - configure your email client to check for email before sending.

In Outlook, go to "Tools" and select "Email Accounts". Make sure "View or change existing e-mail accounts" is checked. Click Next.
Select your account from the list and click "Change".
Select "More Settings".
Select "Outgoing Server".
Check "My outgoing server (SMTP) requires authentication".
Select "Log on to incoming mail server before sending mail".
Click "OK", then "Next", then "Finish".

This will fix your problem
Or
Call Yahoo! Customer Service

USA: 1-866-562-7219 --- 1-800-318-0631
UK 020 7131 1000
Canada: 1-877-722 3755
Direct Number: 1-408-349-1572

Regards
manish

on the port it is 993 SSL

It looks as if the server name is not complete. where is your email coming from? you'll need to know that and the email server (for example: mail.ptd.net for penteledata customers). Or, pop.gmail.com for gmail users. Get that server, then go into your account settings and put the server name into the Incoming Server blank. once you do that and save it (also make sure your outgoing server is correct) you should be fine.

The problem is clearly indicated on the error code.

"the server responded 521 user is over the limit for messages to be sent in a single day."

Have you been sending a lot of messages using that account? From yahoo:

The limit for messages for yahoo is 100 per hour, max 500 per day.

If you believe that you are the one not doing this, you can either report this to yahoo or checked your Yahoo! account immediately. Change the security settings and most specially the passwords. It could be that your account is used as a spam bot.