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How to Forward a Message as an Attachment
Opera doesn't support forwarding messages as attachments. But, there's a workaround.
Export each message and convert it to an eml file.
Goto "Ctrl + F12 -> advanced -> downloads, uncheck "hide file types opened with Opera", select "message/rfc822", click edit and add ", eml" to its file extensions field.
Compose a new message. Fill in the subject and recipients and type any body content you want. Then, attach the eml files to the message.
That will work just like how Thunderbird forwards messages as attachments.