If you are forwarding a MailMessage then you can simply use an assign to add the body and subject
MailMessage.Body = Body text
Mailmessage.subject = Subject
If I need to send a E-mail with Multiple Attachments or attachments with filenames that are generated on the fly, I do the following:
The flow:
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Create a New Mail Message
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Add your Subject
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Add the Body
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Add The attachments using the invoke method activity.
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Specify the attachment you want to add (You can put this invoke inside of a loop or however you need it in order to add multiple files to the mail message
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At this point you can either use a send Outlook or Send Exchange Activity to “forward” on the mail message