This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Əgər kömək lazımdırsa lütfən yeni sual verin.

Can't send email - thunderbird

  • 2 cavab
  • 1 has this problem
  • 3 views
  • Last reply by diegodad

diegodad
diegodad
more options

I installed Thunderbird on a new Windows 10 computer. When I try to send email I get this message: Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) mail.twc.com was lost in the middle of the transaction. Try again. I verified with Spectrum that SMTP is correct using port 587. I tried turning off McAfee anti-virus and firewall.

I installed Thunderbird on a new Windows 10 computer. When I try to send email I get this message: Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) mail.twc.com was lost in the middle of the transaction. Try again. I verified with Spectrum that SMTP is correct using port 587. I tried turning off McAfee anti-virus and firewall.

Chosen solution

Have you tried these settings? Outgoing server mail.twc.com on port 587 with Connection security = None, authentication = password, transmitted insecurely and User name = email address.

https://support.mozilla.org/en-US/questions/1161629

Read this answer in context 👍 0

All Replies (2)

sfhowes
sfhowes
  • Top 10 Contributor
more options

Seçilmiş Həll

Have you tried these settings? Outgoing server mail.twc.com on port 587 with Connection security = None, authentication = password, transmitted insecurely and User name = email address.

https://support.mozilla.org/en-US/questions/1161629

diegodad
diegodad Question owner
more options

Thank you, sfhowes. I checked Connection Security on both my new laptop and an older desktop. The laptop is set to SSL/TLS while the desktop uses STARTTLS. I changes the laptop to STARTTLS and now the problem is gone.