Authentication Wrong

Discussion regarding the Standard version.
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Authentication Wrong

Post by clevera » Wed Aug 15, 2012 3:51 pm

I am sending emails using campaign monitor and sending from an address such as is configured in mailenable on my windows 2008 server and I am receiving the following error as a bounce back from campaign monitor:

Diagnostic-Code: smtp;551 This mail server requires authentication before sending mail from a locally hosted domain. Please reconfigure your mail client to authenticate before sending mail.

I don't understand why this is happening as I am not sending the mail through the mailenable server, just from campaign monitor. Any ideas would be gratefully received.



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Re: Authentication Wrong

Post by MailEnable-Ian » Thu Aug 16, 2012 12:31 am


This is the result of the SMTP security option "Prevent sender address spoofing". When this is enabled any local address that sends to another locally hosted address within MailEnable is enforced to authenticate. If you are running an older version of Standard then I suggest you upgrade. Once you have upgraded to the latest version 6.59 access the SMTP properties and navigate to the "Security" tab. Click on the "Address Spoofing" button and set the option to "Authorised connections can spoof sender address". Also add the IP address of the server where the email campaing applications resides to the SMTP relay options under the "Privliged IP's".

Ian Margarone
MailEnable Support

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Re: Authentication Wrong

Post by Brad555 » Fri Nov 16, 2012 9:46 am

I cant understand that what is the solution of this problem...???????? :D
Last edited by Brad555 on Sat Jan 11, 2014 5:18 am, edited 6 times in total.

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Re: Authentication Wrong

Post by blue7floyd » Wed Nov 21, 2012 9:14 am

This is happening due to your settings. Change your SMTP security option "Prevent sender address spoofing". This option will be enabled. Disable it and then try. This works fine. This is a simpler version of ‘MailEnable-Ian’s reply to the same!

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Re: Authentication Wrong

Post by pondshus2 » Wed Oct 30, 2013 7:32 am

One of my friends actually asked about this to me, and Guess what? I did not know what the hell to say to him. I have no idea about this thing. Maybe I’ll make a research for you. I will be back

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