Optum has recently faxed out notices reminding pharmacies that they should not solicit members for mail delivery or mail any covered prescription services to members. This includes US mail or shipping via any common carrier (FedEx, UPS, DHL).
Unless you have a specialized mail-order contract with OptumRx, this will be considered a violation of contract.
These notices can be somewhat deceiving as they may only list a certain benefit plan and a few BINs. If you read the notice closely, it does state that mailing is subject to termination from all ORx networks.
Optum is not the only PBM that prohibits mailing prescriptions. Humana and Express Scripts also have this stipulation in their provider manuals. Caremark states that if you ship more than 25% of the prescriptions you bill to them in any month, you are no longer eligible to be contracted under the retail pharmacy network.
Please check your contract, provider manual, or PSAO for further information.