Can send Mail Outside Domain SBS 2003 IMAP

Greetings,

I have set up an account to access mail using IMAP for a specific software program we are going to be using. The account can receive mail from the outside but it can not send. I get the following error

Your message did no reach some ofr all of the intended recipients
The following recipient cannot be reached
550 5.7.1 unable to relay for <email address>

any help would be appreciated
cbd1012Asked:
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aces4all2008Commented:
You need to set up your email client to authenticate to your SMTP server (Exchange) for outgoing email.  

1.  Start > Control Panel (Classic View) > Mail  > Email Accounts
2.  Choose the IMAP account and hit change then more settings
3.  On the Outgoing Server tab choose "My outgoing server (SMTP) requires authentication" annd "Use same settings as my incoming server"
4.  Hit OK then OK and try again.
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cbd1012Author Commented:
hi aces

I tried that and i get an error that says that the authentication method is not supported by my server
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aces4all2008Commented:
It looks like the server is set to use TLS for client/server communication.  To set up Outlook to use TLS:

1.  Start > Control Panel (Classic View) > Mail  > Email Accounts
2.  Choose the IMAP account and hit change then more settings
3.  From the Advanced tab enter port 587 for the Outgoing (SMTP) server port and TLS for the type of encryption.
4.  Restart Outlook and try again.
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cbd1012Author Commented:
Thanks Here is what happened

i did that and i got a different error message send test email message : outlook cannot connect to your outgoing smtp email server.
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cbd1012Author Commented:
So i figured it out it was a combination of aces solution regarding TLS encryption and also allowing the account to relay in exchange manager thanks!
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cbd1012Author Commented:
i did not have to switch to port 587 btw
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cbd1012Author Commented:
i did not have to switch to port 587 btw
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