CiviMail not sending to recipients

[ElysseLindell]

Hi,
When I send an email from Civi to an outside email address, I consistently get the following error message:

[ x MAILING ERROR
An error occurred when CiviCRM attempted to send an email (via SMTP). If you received this error after submitting on online contribution or event registration - the transaction was completed, but we were unable to send the email receipt.
The mail library returned the following error message:

authentication failure [SMTP: Invalid response code received from SMTP server while sending email. This is often caused by a misconfiguration in Outbound Email settings. Please verify the settings at Administer CiviCRM >> Global Settings >> Outbound Email (SMTP). (code: 535, response: Incorrect authentication data)]
This is probably related to a problem in your Outbound Email Settings (Administer CiviCRM » System Settings » Outbound Email), OR the FROM email address specifically configured for your contribution page or event. Possible causes are:
Your SMTP Username or Password are incorrect.
Your SMTP Server (machine) name is incorrect.
You need to use a Port other than the default port 25 in your environment.
Your SMTP server is just not responding right now (it is down for some reason).
The FROM Email Address configured for this feature may not be a valid sender based on your email service provider rules. ]

Have any folks had similar issues and is there a way to fix this on the front end? 

[Hershel]

Have you configured outgoing mail? Here are the docs for that:

http://wiki.civicrm.org/confluence/display/CRMDOC/CiviMail+Installation

[Michael McAndrew]

Agree with Hershel.

PS the error message you have posted gives lots of possible causes and ideas for fixing - have you investigated these?  Email config not simple if you have not done it before so might take a bit of work to get right. See also http://book.civicrm.org/user/current/advanced-configuration/email-system-configuration/

Michael