Anything that breaks DKIM so the signature coming from your SMTPd is no longer valid, not matching the public key published in your DNS records, will make your mail MUCH more likely to be flagged as spam.
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SRS[1] doesn't break DKIM, because the sender rewrite happens on my server, before DKIM.
That's the thing, in theory I went from:
spf: fail
dkim: pass
spf: pass
dkim: pass
But as I said, they explicitly mention NOT changing the envelope sender (maybe they have an exception for SRS cases, but it's not documented anywhere).
Oh yeah, and now I'm also responsible for any real spam forwarded to Gmail, since the From is @mydomain.