503 This mail server requires authentication / 503 Valid RCPT command must precede DATA

503 This mail server requires authentication
503 Valid RCPT command must precede DATA

Email to ids other than my-domain-name email id are not getting sent. We get the following error,
The following recipient(s) could not be reached: 'Bill Williams' on 5/16/2005 10:48 AM 503 This mail server requires authentication when attempting to send to a non-local e-mail address



This is a email client configuration issue, please see the following tutorial,
http://www.indichosts.net/flash/email_OE.htm

For more tutorials on other email clients see,
http://www.indichosts.net/tutorials/flash.htm

OR

This means that before sending email, you must set up authentication, which is required by dotCanada's mail servers. To do this, simply follow these steps:

POP before SMTP
Action: Check your email for new mail before trying to send out any email.
What this does: This adds your IP address to a relayhosts file and allows any email to be sent from that IP address for up to 30 minutes. After 30 minutes, you have to authenticate again.

Configure your email client to authenticate automatically
Action: Check the "my server requires authentication" box in your email configuration.
What this does: You will be able to send mail without having to "pop" your mail box first.

If using Microsoft Outlook, please try the following:

Open Outlook.
Go to Tools > Email Accounts.
Select the Account that is causing you trouble and click “Change”.
Click on More Settings.
Click on Outgoing Server Tab.
Click "Outgoing Mail Server (SMTP) requires authentication" and make sure "Use same settings as incoming mail server" is selected.
Click on "Advanced Tab".
Set outgoing Port (SMTP) to 587.
Click OK and then Test Account Settings.



If it fails on Send, then repeat these steps:
Click on "Advanced Tab".
Set outgoing Port (SMTP) to 26.
Click OK and then Test Account Settings.