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On Thunderbird I recieve emails but I am not able to send emails

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Michael
Michael
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On Thunderbird I receive emails but I am not able to send emails Error message is Sending of message failed The message could not be sent because connecting to outgoing server (SMTP) mail.smtp.optusnet.com.au failed. The server may be unavailable or is refusing SMTP connections. Please verify that your outgoing server (SMTP) settings are correct and try again.

On Thunderbird I receive emails but I am not able to send emails Error message is Sending of message failed The message could not be sent because connecting to outgoing server (SMTP) mail.smtp.optusnet.com.au failed. The server may be unavailable or is refusing SMTP connections. Please verify that your outgoing server (SMTP) settings are correct and try again.

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