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. Please ask a new question if you need help.

Why will Thunderbird not 'send' tells me it needs a STARTTLS command

oldbat
oldbat
more options

When I try to send a message from either of my addresses, I get the following message

"An error occurred while sending mail. The mail server responded: 5.7.0 Must issue a STARTTLS command first. Please verify that your email address is correct in your Mail preferences and try again."

When I try to send a message from either of my addresses, I get the following message "An error occurred while sending mail. The mail server responded: 5.7.0 Must issue a STARTTLS command first. Please verify that your email address is correct in your Mail preferences and try again."

Chosen solution

Go to your server settings and change Connection Security to STARTTLS. It sounds like your provider finally entered the present day in email servers.

Tools-Account Settings-Server Settings for inbound server.

Tools-Account Settings-Outgoing Server (SMTP) for outbound server.

No menu bar with Tools? Press the alt key.

Read this answer in context 👍 3

All Replies (1)

user01229325
user01229325
more options

Chosen Solution

Go to your server settings and change Connection Security to STARTTLS. It sounds like your provider finally entered the present day in email servers.

Tools-Account Settings-Server Settings for inbound server.

Tools-Account Settings-Outgoing Server (SMTP) for outbound server.

No menu bar with Tools? Press the alt key.