bug#25802: Unable to run dovecot w/ non-opaque configuration

[Bake Timmons]

Trying to reconfigure my system running guix 0.12.0 for dovecot with
the default configuration object created by '(dovecot-configuration)'
results in:

guix system: error: exception thrown: #<condition %compound [message: "Invalid 
value for field path: \"lmtp\""] 4a6a140>

Adding a services list to the above works around the above error and
allows 'guix system reconfigure' to complete successfully.  However,
the generated dovecot.conf is rejected by doveconf:

doveconf: Error in configuration file /gnu/store...dove.cot.conf line 1: 
Expecting '{'

>From my limited acquaintance with dovecot, the guix-generated syntax of, say,
ImapMaxLineLength 64000

disagrees with what I gather to be the normal dovecot.conf syntax of
imap_max_line_length = 64000

Thanks for your consideration!

Bake
-- 
  Bonard B. Timmons III
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