Teme, I got Anti-E after my PPH blood transfusion. It is exceptionally rare (Less than 1% of the population I was told at the time)
Just to clarify, this is correct, the anti-E antibody itself is relatively rare. Finding E negative blood however, which is what you need to do to provide compatible blood for transfusion, is not a major problem as approximately 52% of the Australian population are E negative - sourced from the Australian Red Cross Blood Service website.

Just wanted to reassure you teme, that finding compatible blood for your DH won't be a big problem Yes it will take a bit longer than for a person with no antibody, but with some notice it is quite easy for a lab to do.

All the best