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I'm using latest SmarterMail (12.5.5409) and after enabling DKIM for domain it looks like something is wrong with message hash. When I'm sending email to my private account at gmail.com I see in source/header "body hash did not verify". TXT DNS entry has been added to DNS zone and verified as correct by Test DNS DKIM tool from SM domain administrator section. Does someone else is experiencing this issue? I've found some entries abour this on old forum but they where related to SM 10.x so I hoped that this has been resolved.
EDIT: I have also confirmation that hash for emails with plain text is being generated correctly.