How can I specify a hash algorithm in Enigmail?

[patrick]

As of version 0.95.0, Enigmail relies by default on GnuPG for selecting the hash (=digest) algorithm.

The hash algorithm can be specified in the file gpg.conf with the following parameter:

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digest-algo   <algorithm>


If you still want to select the hash algorithm from within Enigmail you can do so by modifying the option extensions.enigmail.mimeHashAlgorithm.
The following values are defined for the hash algorithm:

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0 - automatic selection (let GnuPG choose)
1 - SHA1
2 - RIPEMD160
3 - SHA256
4 - SHA384
5 - SHA512