Manual IMAP/SMTP outbound emails were being composed with a
bare email address in the From header, so recipients did not
see the sender's display name.
Gmail already built a proper sender header from Google profile
data, but manually configured IMAP/SMTP accounts had no
equivalent path and fell back to the raw address only.
Fix this by storing the optional sender display name in the
IMAP/SMTP/CALDAV connection parameters, exposing it through
the settings flow and metadata API, and reusing a shared
From-header formatter when composing outbound messages.
The formatter now builds a properly encoded sender header when
a name is available and falls back to the bare email address
when it is not, keeping the behavior safe for blank or missing names.
Gmail keeps using its existing Google-derived display name source;
this change only brings manual accounts up to the same header
formatting standard and removes duplicated formatting logic between
outbound drivers.
After this change, manual SMTP sends and IMAP draft creation include
the configured sender name in the From header, while blank names are
normalized away instead of producing malformed headers.
Existing manual account names are preserved when updates omit the
field, and edited accounts can still explicitly clear it through the
settings flow.
Add focused utility coverage for the shared From-header formatter.
Fixes: #22608
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Co-authored-by: neo773 <neo773@protonmail.com>
Pratik Mahajan
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