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I have the same problem what can I do. ???
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I have the same problem what can I do. ???

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We have a new linux server that users cPanel 11 and is running Horde. &nbsp;Every time that a newly composed message from Horde is sent the following error is displayed.<br />
<br />
There was an error sending your message: authentication failure [SMTP: Invalid response code received from server (code: 535, response: Incorrect authentication data)] <br />
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Horde does accept new messages, and every other function seems to work properly.<br />
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Any ideas on this one?
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We have a new linux server that users cPanel 11 and is running Horde.  Every time that a newly composed message from Horde is sent the following error is displayed.

There was an error sending your message: authentication failure [SMTP: Invalid response code received from server (code: 535, response: Incorrect authentication data)] 

Horde does accept new messages, and every other function seems to work properly.

Any ideas on this one?

Webmail Problem: Horde error code 535, response: Incorrect authentication data

Interactions between email servers and clients are governed by email protocols. The three most common email protocols are POP, IMAP and MAPI. Most email software operates under one of these (and many products support more than one).  The correct protocol must be selected, and correctly configured, if you want your email account to work.

Email Protocols

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.