;type=text/html' \ -F '=)' -F '=@textfile.txt' ... smtp://example.com
Data can be encoded for transfer using encoder=. Available encodings are binary and 8bit that do nothing else than adding the corresponding Content-Transfer-Encoding header, 7bit that only rejects 8-bit characters with a transfer error, quoted-printable and base64 that encodes data according to the corresponding schemes, limiting lines length to 76 characters.
Example: send multipart mail with a quoted-printable text message and a base64 attached file:
curl -F '=text message;encoder=quoted-printable' \ -F '=@localfile;encoder=base64' ... smtp://example.com
--form can be used several times in a command line curl --form "name=curl" --form "file=@loadthis" \
This option is mutually exclusive with --data, --head and --upload-file. See also --data, --form-string and --form-escape. (HTTP IMAP SMTP) Pass on names of multipart form fields and files using backslash-escaping instead of percent-encoding. If --form-escape is provided several times, the last set value is curl --form-escape -F 'field\name=curl' -F 'file=@load"this' \
Added in 7.81.0. See also --form.
--form-string