Hey Mailops! I'm new to the email forwarding community, having taken over ImprovMX <https://improvmx.com/> a few months ago. This is my first message to the mailing group (I've been very curiously lurking for months)!
I'm looking for advice regarding DKIM signing. So it turns out ImprovMX re-signs all forwarded emails with our own DKIM signature, which from my research might not be standard (documentation suggests that mail forwarders add ARC headers, but NOT re-sign using DKIM). This is not a problem for most of our users, but some have been complaining that when ImprovMX forwards emails to a destination guarded by email phishing protection software like Inky <https://www.inky.com/products>, they rewrite the body, and that breaks DKIM and the emails often end up in spam. Is my thinking correct--that we should stop DKIM signing forwarded emails, and rely on ARC? Also let me know if this is not the right place or type of question to ask here! Matthew Tse CEO @ ImprovMX <http://improvmx.com>
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