I'm using KMail version 5.5.1, and I've setup my Gmail account. I had enabled IMAP on Gmail settings, and when I login on KMail the token requested by Akonadi states it has the permission to "send" email as well.

I'm able to receive e-mail just fine, but it never succeeds on sending it. I've played around with the settings, even removed and created the account again multiple times, but it always fails. This is the error message I get:

Failed to transport message. Your SMTP server does not support PLAIN. Choose a different authentication method. The server responded: 5.7.14 <https://accounts.google.com/signin/continue?sarp=1&scc=1&plt=AKgnsbs9 5.7.14 jzXq4OKDQyPJ3BaPADzMj6R1iURaQFFh3xWOG5qI1u-6tLLcie6I796j7eJZ185t1oeCnu 5.7.14 CX_M9EXo_nlDilGSUmpEK76TPwZNA61u1SCMf9sRgIa9sDWaOgUjkPI6wHdH0Zddogp53D 5.7.14 uBe55CvzRxUBovoeASd0bcFFfgExc5Lfbdiq8TY78o0syQuO17bX_wIODM4-0uNwyALppj 5.7.14 oflVkCGvnhFhzmmZeU6YspGQcyG_M> Please log in via your web browser and 5.7.14 then try again. 5.7.14 Learn more at 5.7.14 https://support.google.com/mail/answer/78754 s13sm4583250wma.21 - gsmtp

These are the settings of my outbox after KMail creates the account:

Outgoing server: smtp.gmail.com
Login : my full gmail address
Connection : SSL port 465
Authentication: PLAIN

Now I did play around with Authentication as well, as the message seemed to suggest that was the issue, but it always fails on the other options. And after researching online it seems that my settings match what other people been using. Could use a little help figuring out the problem.

I had the same problem, it's due to the fact that kmail is considered a less secure app. Solved it by doing this:
- Enable 2 factor authentication in google settings
- Generate an app password as stated here: https://support.google.com/mail/answer/185833?hl=en
- In Kmail > Settings > Account > Delivery > Double click on Google Mail > Copy the generated app password in password field

It works for me thank you very much !

Is there a way to enable it without two factor authentication?

void97 wrote:I had the same problem, it's due to the fact that kmail is considered a less secure app. Solved it by doing this:
- Enable 2 factor authentication in google settings
- Generate an app password as stated here: https://support.google.com/mail/answer/185833?hl=en
- In Kmail > Settings > Account > Delivery > Double click on Google Mail > Copy the generated app password in password field

Thanks! This worked for me. Note that one has to set authentication in kmail to "plain" instead of "gmail".

if you want without activate 2-factor auth. (less secure)
You can access to https://myaccount.google.com/security > Apps with account access > switch "Allow less secure apps:" to ON

Basically it's allows google get your plain password as password

molecule-eye wrote:

void97 wrote:I had the same problem, it's due to the fact that kmail is considered a less secure app. Solved it by doing this:
- Enable 2 factor authentication in google settings
- Generate an app password as stated here: https://support.google.com/mail/answer/185833?hl=en
- In Kmail > Settings > Account > Delivery > Double click on Google Mail > Copy the generated app password in password field

Thanks! This worked for me. Note that one has to set authentication in kmail to "plain" instead of "gmail".

I confirmed this works also!

thanks
for me
receiving authentication type in kmail : "gmail"
sending authentication type in kmail: "plain"
works