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Unable to send emails in Thunderbird on an optus mail account

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I am unable to send emails in Thunderbird on multiple optus email accounts. I get an error message saying the outgoing server is not accessible or is being blocked. Optus is being less than helpful in providing the server settings for me to check.

I am unable to send emails in Thunderbird on multiple optus email accounts. I get an error message saying the outgoing server is not accessible or is being blocked. Optus is being less than helpful in providing the server settings for me to check.
Iqhotyoshelwe imifanekiso ekwisikrini

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Please post the settings you are using, as that may prove helpful.