Check the headers and see if it looks like this where it shows ssa.gov handing off to your email server:Couple of tells in the 2nd sentence of the message itself. The common noun "phone" is capitalized and the wording of the sentence is unprofessional sounding.
Received-SPF: Pass (protection.outlook.com: domain of ssa.gov designates 137.200.4.65 as permitted sender) receiver=protection.outlook.com; client-ip=137.200.4.65; helo=sscbulk18.ssa.gov; Received: from sscbulk18.ssa.gov (137.200.4.65) by HE1EUR04FT006.mail.protection.outlook.com (10.152.27.20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1943.19 via Frontend Transport; Sat, 1 Jun 2019 08:37:56 +0000 X-IncomingTopHeaderMarker: OriginalChecksum:GYUJTDFYHU1A76FB4432F4EF76876B72C 567791AB;UpperCasedChecksum;FE4399AB59B080DFF29C36 1D4A17F733D532029555545FF289E4234AB2E33;SizeAsRece ived:1308;Count:11 Received: from nsc-prd-mail-bulk-039.ssa.gov (unknown [10.24.29.41]) by sscbulk18.ssa.gov (Postfix) with ESMTP id 4GD7FlGTyz3
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