How can I start an interactive HEREDOC from a script?

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I use this to start a HEREDOC, type the text and finish up by placing a single dot in the last line:

mutt -s "foo" -- [email protected] << .

The same from within a script will fail due to syntax error.

(sh/zsh/... are expecting to provide the entire HEREDOC within the script itself.)

How can I achieve the desired effect regardless?

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