Set up Thunderbird email program to use encrypted communication
To set up the e-mail program, follow these steps:
The first step
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Open Thunderbird
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The second step
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Under the Accounts section click on View settings for this account

The third step
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on the left, click on Server Settings under the email you wish to modify.
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Ensure that Server Name is written in this format
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<mail.<yourdomain
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Choose SSL/TLS in front of Connection Security (connection protection type)
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Click on OK

The fourth step
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From the Settings menu choose Outgoing Server (SMTP)

Press OK to save the settings
The fifth step
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Select the SSL/TLS connection protection type
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Change port to 465
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press OK to save the settings
