[Exim] acl_smtp_auth options

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Im currently using:

acl_check_auth:

   accept encrypted = *
   accept condition = ${if eq {${uc:$smtp_command_argument}}\
                      {yes}{no}}
   deny message  = TLS encyption required

to make sure people have to auth using ssl. However, id like to disable this
for connections coming from localhost/127.0.0.1, but require it for all
other connections. Is this possible?
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