What email app can filter mail by size? I'm looking for an Android email client (preferably free) for my Galaxy S4 that has the feature of filtering incoming email by size, that is: some kind of rule of the type: if email is more than [insert number] Kb, don't download from server, etc.

An alternative would be to filter incoming mail with attachments, as all I really want is to not download big emails.

I have tried some popular apps including the default Samsung app, CloudMagic, Mailbox and all seem to lack this apparently basic funcionality.

Thanks in advance!
K-9 Mail app (available on PlayStore) will filter by attachments, plus several other choices. It is open sourced and free.