FTP is not a good idea - unless you are specifically asked for that (for a specific file), and the one who asked you is expecting the file there.
Having a FTP folder full of anonymous files uploaded by nobody knows who, not knowing what are malware samples, what are false positive samples, crash related files, somebody trying to make a public warez folder, or something different... is completely useless. The content just gets deleted, there's nothing to do with that. So, simply deleting the sample, or uploading it to the incoming folder on the FTP without previous arrangement - is mostly equal.
Other e-mail? Well, this other e-mail would, in the end, be processed exactly the same way as the usual virus@ e-mail... so what's the point?