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You can find pantheon-mail's data in ~/.local/share/pantheon-mail/. Inside this folder you'll find a folder for each email account. Inside each account folder you'l find an attachements folder, a geary.ini file, and a geary.db file. The geary.db file can be opened with any SQLite client. DB Browser for SQLite works great: sudo apt install sqlitebrowser. The ...
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Nope. It can auto complete when filling in known addresses though. I can't, however tell you exactly how that works, though I believe it uses the evolution backend.
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Delete mail account folder in ~/.local/share/pantheon-mail/
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This feature seems to be not supported in current version of Pantheon Mail. I tested with embedded image and I can reproduce your problem.
However the current version of Geary 3.32 supports this (via right-click). Pantheon Mail was forked from Geary, if I'm not misteaken.
I would consider reporting this to elementary OS developers as a bug/feature request. ...
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