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An error occurred while sending mail:

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Incoming mail continues to work fine. Error only occurs on outgoing:

An error occurred while sending mail: The mail server sent an incorrect greeting: cdptpa-cmomta02 cmsmtp ESMTP server temporarily not available AUP#O-1090.

Started about a month ago, after working for years and through many upgrades. Incoming mail continues to work fine. Error only occurs on outgoing.

Added two new email accounts to the Thunderbird client (for outlook and gmail) about that time. Both of them are currently working fine.

Incoming mail continues to work fine. Error only occurs on outgoing: An error occurred while sending mail: The mail server sent an incorrect greeting: cdptpa-cmomta02 cmsmtp ESMTP server temporarily not available AUP#O-1090. Started about a month ago, after working for years and through many upgrades. Incoming mail continues to work fine. Error only occurs on outgoing. Added two new email accounts to the Thunderbird client (for outlook and gmail) about that time. Both of them are currently working fine.

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Raidersvalle13 start your own thread for your problem. Just a hint though, Thunderbird does not run on or have anything to do with your android device.