I found (at least) one userid within the *SENATE.GOV domain.
It had a host name of BOND. When doing a
dig bond.senate.gov mx
it pointed to the gateway.senate.gov.
-- co-owner INFOSYS, TQM-L, CPARK-L, ERAPPA-L, JANITORS, LDBASE-L, et -L
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31 Shields Bldg. -- Penn State Univ -- University Park, PA 16802-1202 USA