We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Vanwege onderhoudswerkzaamheden die uw ervaring zouden moeten verbeteren, heeft deze website beperkte functionaliteit. Als een artikel uw probleem niet verhelpt en u een vraag wilt stellen, kan onze ondersteuningsgemeenschap u helpen in @FirefoxSupport op Twitter en /r/firefox op Reddit.

Avatar for Username

Zoeken in Support

Vermijd ondersteuningsscams. We zullen u nooit vragen een telefoonnummer te bellen, er een sms naar te sturen of persoonlijke gegevens te delen. Meld verdachte activiteit met de optie ‘Misbruik melden’.

Meer info

Deze conversatie is gearchiveerd. Stel een nieuwe vraag als u hulp nodig hebt.

Thunderbird will no longer send messages

  • 1 antwoord
  • 0 hebben dit probleem
  • 1 weergave
  • Laatste antwoord van david

gavintaylordrums
gavintaylordrums
more options

Hi there! Thanks for your help. I have been using Thunderbird for my email client for my business for the past 3 years. Starting about 4 weeks ago, the outgoing emails I try to send do not go through and I get an error message saying "Mail delivery failed: retunring message to sender." This seems to happen primarily with gmail accounts.

The text in the failure email is below. Thanks for any help you can give!

- Gavin

"host gmail-smtp-in.l.google.com [142.250.102.27] 

   SMTP error from remote mail server after pipelined end of data:
   550-5.7.26 This mail is unauthenticated, which poses a security risk to the
   550-5.7.26 sender and Gmail users, and has been blocked. The sender must
   550-5.7.26 authenticate with at least one of SPF or DKIM. For this message,
   550-5.7.26 DKIM checks did not pass and SPF check for [gavinbowescounseling.com
   550-5.7.26 ] did not pass with ip: [66.96.186.8]. The sender should visit
   550-5.7.26  https://support.google.com/mail/answer/81126#authentication for
   550 5.7.26 instructions on setting up authentication. v11-20020aa7d9cb000000b0051bdef1df27si628503eds.406 - gsmtp..."
Hi there! Thanks for your help. I have been using Thunderbird for my email client for my business for the past 3 years. Starting about 4 weeks ago, the outgoing emails I try to send do not go through and I get an error message saying "Mail delivery failed: retunring message to sender." This seems to happen primarily with gmail accounts. The text in the failure email is below. Thanks for any help you can give! - Gavin "host gmail-smtp-in.l.google.com [142.250.102.27] SMTP error from remote mail server after pipelined end of data: 550-5.7.26 This mail is unauthenticated, which poses a security risk to the 550-5.7.26 sender and Gmail users, and has been blocked. The sender must 550-5.7.26 authenticate with at least one of SPF or DKIM. For this message, 550-5.7.26 DKIM checks did not pass and SPF check for [gavinbowescounseling.com 550-5.7.26 ] did not pass with ip: [66.96.186.8]. The sender should visit 550-5.7.26 https://support.google.com/mail/answer/81126#authentication for 550 5.7.26 instructions on setting up authentication. v11-20020aa7d9cb000000b0051bdef1df27si628503eds.406 - gsmtp..."

Alle antwoorden (1)

david
david
  • Top 10 Contributor
more options

This indicates a security error for your account, and can only be fixed by your email provider. Be sure to notify them of this, as the problem will not go away. Google has been tightening security recently and we see posts such as yours regularly.