I have Enigmail 1.5.1 running on Thunderbird 17.0.3 running on RHEL 6 Linux.

When I try to send an email, Thunderbird shows a dialog that says:
    Failed to initialize Enigmail.
    Send unencrypted message?
    [ Cancel ]   [ Send Message ]
(I don't really use encryption but do sign things.)


If I look under the OpenGPG -> Preferences, I see:
    Files and Directories:
        Could not find GnuPG
        [ ] Override with [......]

If I issue 'which gpg' at the command line, it responds with
'/usr/bin/gpg', and if I run either 'gpg' or '/usr/bin/gpg', it seems to
work. (It responds with 'gpg: Go ahead and type your message ...'.)

If I turn on expert settings and look at OpenGPG -> Debugging Options ->
View Console, I see this:
    Initializing Enigmail service ...
    EnigmailAgentPath=/usr/bin/gpg

    enigmail> /usr/bin/gpg --version --version --batch --no-tty
--charset utf-8 --display-charset utf-8
    gpg (GnuPG) 2.0.14
    libgcrypt 1.4.5
    Copyright (C) 2009 Free Software Foundation, Inc.
    License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
    This is free software: you are free to change and redistribute it.
    There is NO WARRANTY, to the extent permitted by law.

    Home: ~/.gnupg
    Supported algorithms:
    Pubkey: RSA, ELG, DSA
    Cipher: 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH,
CAMELLIA128,
                CAMELLIA192, CAMELLIA256
    Hash: MD5, SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224
    Compression: Uncompressed, ZIP, ZLIB, BZIP2

    enigmail> /usr/bin/gpg-connect-agent


Just in case it's relevant, when I press 'OK' in the settings dialog,
Enigmail responds with 'Your system uses gpg-agent or a similar tool for
passphrase handling (gpg-agent is mandatory if GnuPG v2.0 or later is
used). Since caching of passphrases is handled by gpg-agent, the
respective timeout settings in OpenPGP are disregarded. In order to
change passphrase caching options, please configure your gpg-agent tool.'


Finally, until recently, Enigmail worked correctly. I *think* it stopped
working recently when we had an OS update. Unfortunately, I'm not sure
what all changed, but quite possibly Thunderbird was updated at this point.


Any suggestions as to what might be wrong?

Evan


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