Joining potential with passive

In Japanese, how would you join the potential form of a verb with the passive form? For example, 送れる ＋ 送られる ＝ 送れられる (i.e. able to be sent). Or would you say 送れることが出来る?

From looking up words in Google 食べられられます (able to be eaten) brings up almost 1800 results, but 食べられることができます + 食べられることが出来ます bring up more than 3000 results. However, I know られる has other uses that I'm not too sure of yet (politeness?) so maybe those results are skewed somehow.

Need a word or phrase translated? | Page 149 | Japan Forum

See it yet ? Here is an answer from undrentide to this question about 2/3 down the page.

Whoa, how'd you manage to find that little gem? Let me guess, you put "passive" and "potention" in the search engine?