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Resolving Thunderbird/Enigmail decryption errors for encrypted emails with large attachments
Last modified on 12 November 2015 05:14 PM

The Thunderbird email client, using the Enigmail plugin, may fail to decrypt and open emails with attachments above 20mb or so in size. Typically, the email fails to open, and errors along the lines of "Decryption incomplete; click Key icon" and "Error - IMAP message too large to decrypt/verify" are shown.

The issue lies in Thunderbird's handling of mail attachments. To work around this issue, please select Enigmail -> Preferences -> Advanced from the Thunderbird menu bar, and then make sure the option "Only download attachments when opened (IMAP only)" is unchecked.

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