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535 5.7.8 Error: authentication failed: Invalid authentication mechanism


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7 minutes ago, Randy Calvert said:

It’s saying something you’ve provided is wrong. It could be that you’ve chosen the wrong version of SMTP protocol or the port number is wrong. 

But this is not an IPB issue. It cannot handle authentication issues. 

Thank you for your help but no it's not something I've provided wrong, it said "Invalid authentication mechanism", as I said, my credentials are ok, because I've tried them on https://dnschecker.org/smtp-test-tool.php and the mail was sent and received without any issue.

I tried all methods (Plain Text, SSL, TLS) but still same issue.

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34 minutes ago, Marc Stridgen said:

As has already been mentioned there, you need to check this with your provider. The message there is coming from your email service

Hum ok, but how do you explain when I try the credentials on https://dnschecker.org/smtp-test-tool.php the mails are sent and received without any issue and not on my Invision forum ?

In my opinion it's an easy response to say "check this with your provider ..." without investigate why we have this message. It's not a credential issues, it's an "authentication mechanism" problem.

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19 minutes ago, Hachemi said:

Hum ok, but how do you explain when I try the credentials on https://dnschecker.org/smtp-test-tool.php the mails are sent and received without any issue and not on my Invision forum ?

This would be a question for your email host also

20 minutes ago, Hachemi said:

In my opinion it's an easy response to say "check this with your provider ..." without investigate why we have this message. It's not a credential issues, it's an "authentication mechanism" problem.

While I understand the conclusion you seem to have arrived at here, we have many thousands of people using SMTP on a daily basis on our software, and the error message itself is not being thrown by our software. The error is being returned from your email hosting provider.

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