Email Delivery Pending /Failures

Hello All,

We are having issues with mail delivery today. Looking at the logs in Exchange I am seeing the following entries. Anyone else having issue? 

Reason: [{LED=450 4.4.317 Cannot connect to remote server [Message=451 4.4.0 Socket error SocketError] [LastAttemptedServerName=relay-us-east-2.prod.hydra.sophos.com] [LastAttemptedIP=18.220.6.134:25] [DM6NAM10FT035.eop-nam10.prod.protection.outlook.com]};{MSG=451 4.4.0 Socket error SocketError};{FQDN=relay-us-east-2.prod.hydr. OutboundProxyTargetIP: 18.220.6.134. OutboundProxyTargetHostName: relay-us-east-2.prod.hydra.sophos.com

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