Cascaded Rewriting

Hello,

I am planning to use libsrs2 for our mail system. It will replace our own 
rewriting scheme.
My question is, what happens if cascaded encoding appears using srs.
In particular, is it possible to feed an address into srs_reverse, it is 
properly decoded, but still encoded (by SRS means)? Double encoding. Is that 
possible with SRS? Will the decoded sender address be definitely valid when 
no error occured or do I have to check afterwards in case I might have to do 
it again.

I don't know if I horribly misunderstood something here but in our old scheme 
this was possible so I just want to know.

Greetings...

Stephan