I understand what you are saying, but it is not an answer to my question. Perhaps, my question wasn't specific enough.
Let's try again.
I have a local exim server that Thunderbird uses for outgoing mail. The exim server adds a DKIM signature to outgoing mail from one domain before it relays the message to Fastmail (first logging-in with proper credentials) for delivery to the recipient's SMTP server.
I have not yet used Runbox in this way. If I were to, would the exim DKIM signature remain valid?
Thank you.
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Jacinto
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