Currently Aspose.Email cloud supports msg, mht & eml file formats.
However its brother Aspose.Email for .NET supports many other formats including OFT.
Request you to allow OFT file download via Aspose.Email cloud.
Thanks for contacting support and sorry for the delayed response.
We are further looking into above request and will keep you updated on the status of correction. Please be patient and spare us little time.
We are sorry for the delayed response. Kindly note, the latest version of Aspose.Email Cloud API already supports the OFT file format.