All outgoing mail shall be stamped on the reverse side of the envelope with language indicating that the correspondence is sent from a correctional institution. Mail shall be stamped in blue ink only; the stamp shall read as follows:
"This correspondence is forwarded from a Massachusetts Correctional Institution. The contents may not have been evaluated and the Department is not responsible for the substance or content of the enclosed material. If you have received unwanted correspondence from this inmate, call 1-866-684-2846 to stop future correspondence."
At no time shall outgoing mail be collected or otherwise handled by an inmate. All outgoing mail, including inter and intra-office mail, shall be processed through the institutional mailroom.
103 CMR, § 481.07