Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Rechercher dans l’assistance

Évitez les escroqueries à l’assistance. Nous ne vous demanderons jamais d’appeler ou d’envoyer un SMS à un numéro de téléphone ou de partager des informations personnelles. Veuillez signaler toute activité suspecte en utilisant l’option « Signaler un abus ».

En savoir plus
Résolu

After the last Thunderbird update I cannot send e-mails but still receive emails as usual. When sending I get a error message Must issue a STARTTLS command but all settings seems to be OK

Thunderbird Envoyer et recevoir des e-mails
david a répondu
ateurope
ateurope

Thunderbird Send message Error Sending of the message failed An error occurred while sending mail. The mail server responded: Must issue a STARTTLS command first. For more info, go to https://support.google.com/a/answer/3221692 and review RFC 3207 specifications. ffacd0b85a97d-47aa0f2186bsm33992962f8f.36 -gsmtp. Please verify that your email address is correct in your account settings and try again.

Note: I could not find the suggested specifications as indicated in the error message!

I did not change anything, the sending error occurred suddenly , all my settings IMAP Mail Server Port 993 SSL/TLS OAuth2 and SMTP Port 465 are still set to default. I changed also the SMTP to an new shown default 587 but non of this settings resolved the problem

Thunderbird Send message Error Sending of the message failed An error occurred while sending mail. The mail server responded: Must issue a STARTTLS command first. For more info, go to https://support.google.com/a/answer/3221692 and review RFC 3207 specifications. ffacd0b85a97d-47aa0f2186bsm33992962f8f.36 -gsmtp. Please verify that your email address is correct in your account settings and try again. Note: I could not find the suggested specifications as indicated in the error message! I did not change anything, the sending error occurred suddenly , all my settings IMAP Mail Server Port 993 SSL/TLS OAuth2 and SMTP Port 465 are still set to default. I changed also the SMTP to an new shown default 587 but non of this settings resolved the problem
david
david
  • Les 10 premiers contributeurs
Lire cette réponse dans son contexte

Solution choisie

Problem resolved in this thread: https://support.mozilla.org/en-US/questions/1591992

Toutes les réponses (3)

david
david
  • Les 10 premiers contributeurs

Please post a screenshot of the SMTP server settings pane. That may prove helpful. The error message indicates it should be set to STARTTLS.

ateurope
ateurope Auteur de la question

Hi David Enclosed is the screen shot of my last attempt you have requested. emails can be received but still not be sent

Heinz

david
david
  • Les 10 premiers contributeurs

Solution choisie

Problem resolved in this thread: https://support.mozilla.org/en-US/questions/1591992

Poser une question

Vous devez vous identifier avec votre compte pour répondre aux messages. Veuillez poser une nouvelle question, si vous n’avez pas encore de compte.