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(mailcrypt.info)Limitations

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Limitations
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   Mailcrypt is a powerful program, but it is not a complete PGP
interface.  Perhaps some future version will be; in the meantime, you
will need to use the command-line interface for some operations.
Things which the current version does not support include:

_Complete Key Management_
     Mailcrypt's key management support is limited to adding and
     extracting keys from keyrings.  It does not support key
     generation, key removal, key revocation, ID and trust parameter
     editing, or key signing.  It also ignores PGP's warnings when you
     use a key which is not fully certified.  (Of course, you can see
     these warnings by viewing the `*MailCrypt*' buffer; see Note:
     Tips.)

_Encryption with Conventional Cryptography_
     Mailcrypt supports decryption but not encryption with
     "conventional" (i.e., non-public key) cryptography.

_Detached Signatures_
     Mailcrypt does not support the creation nor the verification of
     detached signatures.

_"For your eyes only" Decryption_
     Mailcrypt will be unable to decrypt a file which was encrypted
     with the "for your eyes only" (`-m') option.  This is actually a
     bug in PGP, which provides no portable way to avoid its paging
     behavior.