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.

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

smtp setting

  • 1 reply
  • 1 has this problem
  • 3 views
  • Last reply by Toad-Hall

more options

Thunderbird 91.3.2 (64 bits)Windows 10

Stopped sending notes, message "cannot reach smtp server" Checked setting and found port is 465 . Corrected to 587 as instructed by provider. Setting changes without my intervention to 465!!!

ALso: provider instruct to use TLS, but choice is STARTTLS or SSL/TLS.

Thunderbird 91.3.2 (64 bits)Windows 10 Stopped sending notes, message "cannot reach smtp server" Checked setting and found port is 465 . Corrected to 587 as instructed by provider. Setting changes without my intervention to 465!!! ALso: provider instruct to use TLS, but choice is STARTTLS or SSL/TLS.

Chosen solution

If using port 587 - use STARTTLS If using port 465 - use SSL/TLS

re: provider instruct to use 587 and TLS, but choice is STARTTLS or SSL/TLS. Use STARTTLS

Read this answer in context 👍 1

All Replies (1)

more options

Chosen Solution

If using port 587 - use STARTTLS If using port 465 - use SSL/TLS

re: provider instruct to use 587 and TLS, but choice is STARTTLS or SSL/TLS. Use STARTTLS