8. Signature and encryption.........................................................42
8.1. Account settings......................................................................................42
8.2. Signature and verification........................................................................45
8.2.1. Signing a message...........................................................................45
8.2.2. Verifying a signature.........................................................................47
8.2.3. Retrieving the key that signed the message....................................50
8.3. Encryption and decryption.......................................................................53
8.3.1. Encrypting a message......................................................................53
8.3.2. Decrypting an encrypted message..................................................55
8.4. Handling attachments..............................................................................59
8.5. Notes.......................................................................................................60
8.6. Per-recipient rules...................................................................................61
8.6.1. Per-Recipient Rules Editor...............................................................61
8.6.2. Recipient Settings............................................................................62
8.6.3. Notes................................................................................................63
8.6.4. XML format of per-recipient rules.....................................................64
9. Preferences................................................................................66
9.1. Setting the preferences...........................................................................66
9.1.1. Basic.................................................................................................66
9.1.2. Sending............................................................................................69
9.1.3. Key Selection...................................................................................71
9.1.4. Advanced..........................................................................................72
9.1.5. Keyserver.........................................................................................75
9.1.6. Debugging........................................................................................76
9.2. Manually editing the preferences............................................................77
10. Troubleshooting......................................................................86
10.1.1. Thunderbird / SeaMonkey displays a red error message at the
bottom of the mail window..........................................................................86
10.1.2. Enigmail fails to install on SeaMonkey...........................................86
10.1.3. Enigmail fails to install on Firefox...................................................87
10.1.4. The Add-ons Manager shows “This item will be installed after you
restart Thunderbird”. Or, there is no Enigmail user interface visible.........87
10.1.5. I have updated Enigmail on Thunderbird, and now it keeps telling
me: “A previous install did not complete correctly. Finishing install.”.........87
10.1.6. I can't tell whether Enigmail works or not.......................................87
10.1.7. I installed a new extension and Enigmail stopped working...........88
10.1.8. Enigmail icons in the toolbar are misaligned.................................88
10.1.9. Enigmail is unable to access the keyserver...................................88
10.1.10. My own signatures are invalid. Enigmail replaces “>” with “|” and
spaces with “~” in quoted messages..........................................................88
10.1.11. I use a non-English character set, and my own signatures are
invalid.........................................................................................................89
10.1.12. Enigmail sees some emails as broken.........................................89
10.1.13. I get an error “Enigmail / Enigmime / IPC failed to initialize”.......89
10.1.14. I cannot read encrypted messages sent to me! I get an error
“Secret key needed to decrypt message”..................................................89
10.1.15. I lost my passphrase / my key pair / my private key....................89
10.1.16. After I reinstalled Enigmail, all keys have disappeared from the
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