Hi,

could you please reconsider closing this bug and consider fixing it or at least providing an option for standard behaviour?
Leaving aside the question of performance impact of postprocessing in longer mails (for those, email may not a be good optionin the first place), the module as is renders the email.Generator mostly useless for multipart messages with binary data that needs to be standards compliant, e.g. Multipart-Messages containing images, possibly signed or uploading (with httplib) multipart/form-data.

Thank you for your consideration.

Kind regards

Thomas