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Error code: ssl_error_rx_malformed_server_key_exch

If you are receiving the error:

Error code: ssl_error_rx_malformed_server_key_exch

Try deleting the cert.db file in your profile directory. Here's how:

1) Quit or Exit from Postbox so that it is no longer running.

2) Navigate to:

macOS

~/Library/Application Support/Postbox/Profiles/[some.profile]/cert.db

Note: In macOS the Library folder is hidden. To access it, open the Finder, hold the Option key, then select Library from the Go menu.

Windows

Users\username\AppData\Roaming\Postbox\Profiles\[some.profile]\cert.db

Note: The AppData folder is folder is a hidden folder; to show hidden folders:

Windows Vista / 7 - Open a Windows Explorer window and choose "Organize → Folder and Search Options → Folder Options → View (tab) → Show hidden files and folders".

Windows 8 and higher: Open a Windows Explorer window and choose "View Tab → Options → Change Folder and Search Options → View Tab → Show hidden files and folders, then click the Apply button".

3) Delete the cert.db file.

4) Start Postbox.