addition to the documentation

[No Spam]

On 17-01-28 12:54:12, J wrote:
> add a wrapper like this around your offlineimap [not sure if this could
just realized you could use the line

presynchook = zfs snapshot path/to/Mail@$(date +%Y%m%d%H%M%S)offlineimap

which is much cleaner that the suggestion before
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