Preserve SMTP envelope recipients when relaying#6
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mkitchingh merged 4 commits intomainfrom Mar 10, 2026
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Fixes relay dropping BCC recipients.
The relay was reconstructing recipients from MIME headers when sending upstream. BCC recipients are often not present in message headers, only in the SMTP envelope (RCPT TO).
This change forwards the envelope sender and recipient list from IMessageTransaction so all accepted recipients (To, Cc, Bcc) are relayed correctly.