Hello there We have read the messsge We try to help.

you can no longer send emails. Do you work with a laptop or PC? The transmission fails while you are using Thunderbird.

This act of sending an email only goes so far.

Do you have further information on this subject?

I can ask you for the Smtp configuration After checking this, I can send you a form.

Can you explain approximately how this came about? Can you send me more about this and/or a screenshot of it?

https://support.mozilla.org/en-US/kb/cannot-send-messages

https://support.mozilla.org/en-US/kb/how-to-make-screenshots

Greetings Firefox volunteer.

Hello there

This is a common subject of authentication.

A valid username and password. To send mail.

But it could be different for your email client.

Check the settings , reset the settings , filling in the correct configuration. Filling in the good username and password.

Greetings Firefox volunteer

This same issue has sprung up for after the last update. Will not send: do to accepting server detects spam like characters in the email. Sent a clean email IE: no signature, it produces a password issue, which upon investigation, is the correct password. Last error with a plain jane email, no links or signature or code for signature box, the smtp server times out.

ports are correct 587 or 465 starttls and plain password. Authentication process is set correct to isp protocol could installation have become corrupt? not running any email scanners or email virus programs

mail will send from isp webmail page.

ThunderBird issue since last update. Is there a correction for his issue? This is not a config issue as I have gone through the settings with isp. Most likely an update issue or corruption issue since last update. Been running thunderbird for many years