Not just likes to mail things, they basically try to force you to use the mail pharmacy service that they own.
My Aetna policy will deny all prescriptions for anything greater than 30 days supply or multiple refills unless you go through their mail pharmacy - it's the only way to get a 90 day supply.
And yup. Their online service often is "unable to determine status" of a prescription that they are filling, which means I can't even order a refill through them.
We spend a lot of time arguing on the phone.