Trying sending with a POP3 account, suddenly i get this error:

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Sending failed:
Your SMTP server does not support PLAIN. Choose a different authentication method. The server responded: "5.7.0 Error: authentication failed: generic failure"
The message will stay in the 'outbox' folder until you either fix the problem (e.g. a broken address) or remove the message from the 'outbox' folder.
The following transport was used: Optinet.hr
Continue sending the remaining messages?

If i click continue sending, then i get this:

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Sending failed:
Your SMTP server does not support PLAIN.
Choose a different authentication method.
The server responded: "5.7.0 Error: authentication failed: generic failure"
The message will stay in the 'outbox' folder until you either fix the problem (e.g. a broken address) or remove the message from the 'outbox' folder.
The following transport was used:
 Optinet.hr

My authentication method is set to Clear Text ,not to PLAIN.If i switch to another method i get the same exact error, even if i turn off encryption.

Using Kmail 1.13.7 and KDE 4.6.5 on Fedora 15.


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Have you tried asking KMail to automatically detect the used authentication method? Have you verified with your email provider that those are the correct settings?

When i click to check what the server supports, only Clear Text seems available.The setting are the same i use on the Windows partition and in Thunderbird and it worked on Kmail until 2 days ago.

If you shutdown KMail, then verify it is no longer running in the process list, and no kio_pop3 processes are running, does starting it now still trigger the error?

What happens if you remove then add your POP3 account again?

bcooksley wrote:If you shutdown KMail, then verify it is no longer running in the process list, and no kio_pop3 processes are running, does starting it now still trigger the error?

What happens if you remove then add your POP3 account again?

Strangely, i only removed my identity, but i didn't think to delete my account.Now it seems to work.Thanks for your help!

I'm having the same problem. It is not reproducible; i.e. sooner or later the messages will go through. Some will get sent quickly, others take more time, but so far all went out in a matter of minutes after the error appeared. I checked my settings, and AutoDetect is the only connection possibility. PLAIN is the only authentication possibility. Encryption is set to TLS, but if I change it to SSL, it goes back to TLS.

What is the version of KMail that you are using? Are you using ISP/work/similar supplied SMTP server or something like GMail?

P.S.: For future enquiries, it is advisable not to "necro post" (bump a thread that's years old) and open a new a thread instead.

The problem could be the Two-step Authentication that you have activated for your Google account. You have to get a one-time special password for applications. Check your Google account security options for it.