Message not sent. Server replied: Authentication failed

I'm also having trouble with this. The problems started recently when our servers were moved. The full error is:

"There was an error sending your message: authentication failure [SMTP: Invalid response code received from server (code: 535, response: Incorrect
authentication data)]"

 

I can also confirm that I have experienced this issue.

In my case its when you try to access your webmail box through cpanel
The reason this goes wrong is because it tries to authenticate itself to SMTP with your CPANEL user info. now since your CPanel user has nothing to do with SMTP, it will not properly authenticate and give that error.

Instead try to access your webmail through DOMAIN.com/webmail ,
This should work.

Now obviously you should also be able to use your webmail through cpanel,
this is a bug and will probably be fixed later on.

Please could anyone else that experienced this issue REPLY and confirm that this was the same issue?

 

I am getting this error on Horde using
cPanel 11.24.7-E34209 - WHM 11.24.4 - X 3.9
CENTOS 5.2 i686 on standard

There was an error sending your message: authentication failure [SMTP: Invalid response code received from server (code: 535, response: Incorrect authentication data)]

I also get errors in all of the other webmail programs as well.

 

Yes, thats correct. All we did was turn off:
Allow mail account authentication using the password of the domain owner's account- in the Mail - Tweak Settings and issue is resolved. It now asks the user for their mail password when logging into webmail via cpanel or externally and mail is being sent correctly.

 

The thing that fixed my issue -
was a few things - first of all I wasnt getting updted files as the repository I was using shut down and I didnt know it.

Second - Cpanel support went in and looked at it, and regenerated the passwords file. That corrected the issue.

 

Anyone know how to regenerate the passwords file? Getting the same error and tried all other suggestions on similar posts in forum.

 

How can i regenerate the passwords file?

 

We had the same symptoms on one of our servers after unsuspending an account. The problems were limited to the unsuspended account.

None of the suggestions above resolved the issue (they weren't listed in demodomains or demo accounts, the Tweak settings flag wasn't set, etc). Also tried logging in with user+domain.com instead of using '@' but that made no difference.

Additionally tried restarting Exim and changing the passwords but that didn't resolve either.

The customer still has a couple of mailboxes that they check but don't send from that I left in place. Please feel free to contact us if you would like me to try something on the remaining accounts or for more info.

Hope that helps,

Chris

 

Try suspending then un-suspending the account again.

 

Not tested as I dont have this problem anymore -

 

Doesn't work.

The only solution that i found that worked was to set squirrelmail to send via sendmail and bypass smtp entirely.

 

So this issue only affected Squirrelmail?

 

No it affects all webmails, i fixed squirrelmail so the client had at least one webmail that worked. Of course on each update squirrelmail is set back to smtp

If the client logs directly into webmail (url:2096)then webmail can send. It's only if the client logs into their webmail via the admin control panel webmail links - that the webmails get an authorisation error.

 

So this issue is just limited to webmail? Regular SMTP, POP and IMAP connections work just fine?

 

yes and only if they login to webmail via the admin control panel. A client first noticed it about the time i upgraded to the version that had "Allow mail account authentication using the password of the domain owner's account" - so i surmise that this feature has a bug.

 

I tried this on a test server running cPanel 11.24.4-R35075 - WHM 11.24.2 - X 3.9 CENTOS 4.7 i686 standard without issue. Though if it is a bug, the best thing to do would be to have our technical analysts look into this so we can confirm if this is indeed a bug so we can take corrective action: http://tickets.cPanel.net/submit

 

In our case, all SMTP connections were affected from various clients. We only tried SquirrelMail as the issue seemed to affect any client trying to send from the account. We did try suspending/unsuspending and resetting passwords on the individual mailboxes in addition to restarting Exim.

 

Looks like we were updating our tickets at the same time.

Please feel free to submit the bug; we're in the process of updating the affected server but will be willing to assist with testing if you like.

The affected server is cPanel 11.24.4-S33345 - WHM 11.24.2 - X 3.9
CENTOS 4.4 i686 on standard.

Cheers,

Chris