Horde mail issue

If you cannot login to Horde of any mail account of the domain with right password and username, then please check the following:

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1. Check the domain entry(domain.com)  in the file "/etc/userdomains".
2. If the domain entry(domain.com) is missing manually add the domain in this file.
3. Now try logging in to the Horde of the mail account and this will work.
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We have another problem now we can access Horde but if we send any mail, we will get the following error.

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Error
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There was an error sending your message: Failed to add recipient: user@domain.com  [SMTP: Invalid response code received from server (code: 451, response: Temporary local problem - please try later)]
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This is due to the missing domain entry in the file "/etc/localdomains". Add the domain entry(domain.com) in the file "/etc/localdomains" and then try sending mail. It will work.

The issue is fixed.

Have a nice day :)