[stable5.10] fix(sending): preserve Bcc header in Sent mailbox copy#13259
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Horde_Mime_Mail::addHeader('Bcc', ...) silos the Bcc value into a
separate $_bcc field instead of $_headers, so getRaw() never includes
it. The raw message stored in the Sent mailbox therefore had no Bcc
header, unlike Evolution, Thunderbird, and Horde IMP.
Mirror Horde IMP's approach: build Horde_Mime_Headers directly with Bcc
included, strip it from a clone for SMTP delivery (RFC 5321), and pass
the full headers to $mimePart->toString() for the Sent mailbox copy.
Assisted-by: Claude:claude-sonnet-4-6
Signed-off-by: Christoph Wurst <1374172+ChristophWurst@users.noreply.github.com>
ChristophWurst
approved these changes
Jul 7, 2026
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Backport of PR #13180