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i cannot send emails from Thunderbird

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I am unable to send messages from Thunderbird This is the error message I receive

Sending of the message failed. An error occurred while sending mail: Unable to establish a secure link with Outgoing server (SMTP) smtp.telstra.com using STARTTLS since it doesn't advertise that feature. Switch off STARTTLS for that server or contact your service provider.

I am not tech savvy so dont know what to do to fix it

I am unable to send messages from Thunderbird This is the error message I receive Sending of the message failed. An error occurred while sending mail: Unable to establish a secure link with Outgoing server (SMTP) smtp.telstra.com using STARTTLS since it doesn't advertise that feature. Switch off STARTTLS for that server or contact your service provider. I am not tech savvy so dont know what to do to fix it

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The telstra site indicates the SMTP server should be 465 and SSLTLS or 587 and STARTTLS . You can check this by rightclick account name, click 'settings', then scroll down to 'Outgoing Server SMTP' and click 'edit' for your server. From there you can change as needed.

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Hi David Thank you for your response. I did what you suggested and when I weny into my settings it is already set to the default of 587 STARTTLS Telstra Bigpond

So I dont know what to do next ???

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According to mxtoolbox.com, the telstra smtp doesn't support TLS. Try port 465 with SSL/TLS instead.

https://mxtoolbox.com/SuperTool.aspx?action=mx%3atelstra.com&run=toolpage