Unable to create exchange connector

Copper Contributor

While creating connector in O365 mail flow, I am facing issues. 
smart host - I have confgured postfix as a relay server and am using the IP as smart host. 
Vaidation email - Email configured for one of the user in the exchange. 
But validation is failing with the message, " 

The test email was routed out from O365 without using any connector."

Timestamp:2/22/2023 5:21:37 PM
EventId:RECEIVE
Source:SMTP
MessageSubject:Test email for connector validation
MessageId:<email address removed for privacy reasons>
Recipients:email address removed for privacy reasons
RecipientCount:1
RecipientStatus:
SourceContext:08DB13985E340CE4;2023-02-22T17:21:36.376Z;0
Sender:email address removed for privacy reasons
EventData:ProxyHop1:PN2PR01CA0082.outlook.office365.com(2603:1096:c01:23::27), MimeParts:Att/Emb/MPt:0/0/1, MessageValue:MediumHigh, Replication:PN2P287MB0413, InboundTlsDetails:TLS=SP_PROT_TLS1_2_SERVER TLSCipher=CALG_AES_256 TLSKeyLength=256 TLSKeyExAlg=CALG_ECDH_EPHEM, CorrelationId:2dfcb092-59d2-43ff-22c5-08db14f9406c, FirstForestHop:MA0P287MB0401.INDP287.PROD.OUTLOOK.COM, FromEntity:Internet, DeliveryPriority:Normal, OriginalFromAddress:<>, AccountForest:INDP287A002.PROD.OUTLOOK.COM


Timestamp:2/22/2023 5:21:37 PM
EventId:RECIPIENTINFO
Source:RESOLVER
MessageSubject:Test email for connector validation
MessageId:<email address removed for privacy reasons>
Recipients:email address removed for privacy reasons
RecipientCount:1
RecipientStatus:UserMailbox.Forwardable.Resolver.CreateRecipientItems.40
SourceContext:
Sender:email address removed for privacy reasons
EventData:SenderVerdict:NotFound.OneOff.Sender.10, DeliveryPriority:Normal, OriginalFromAddress:<>, AccountForest:INDP287A002.PROD.OUTLOOK.COM


Timestamp:2/22/2023 5:21:38 PM
EventId:AGENTINFO
Source:AGENT
MessageSubject:Test email for connector validation
MessageId:<email address removed for privacy reasons>
Recipients:email address removed for privacy reasons
RecipientCount:1
RecipientStatus:
SourceContext:CatContentConversion
Sender:email address removed for privacy reasons
EventData:TRA:ETRI|MsgType=|Ex=|IsKnown=|FipsStatus=|AttchUns=|ceErr=|Synth=ON, CFA:AS|sfv=NotSpam|rsk=Low|scl=0|bcl=0|score=|sfs=(4505002)(4700075)(3230221)(823300339)(823320095)(902153)(20180801249)(3231657)(944501753)(14220107066)(88885384)(99994043)(15022040)(15041020)(15015020)(5410004)(54410004)(54510008)(54710008)(5420007)(76000234)(930200077)(7005007)(6201001)|sfp=0|fprx=|mlc=|mlv=|list=1|di=|rd=|h=PN2P287MB0673.INDP287.PROD.OUTLOOK.COM|ctry=|cltctry=|lang=|cip=|dir=Originating|alat=0|mlat=3|rlat=3|asf=, CFA:LTC|RPLHCFR=32|RPLSLR=0|RPLAPR=1|RPLMR=32|RPL=66|RSP=227, PCFA:SUM|hctfp=950f06b4-c31d-4e93-9828-1a8afa968a03, SFA:SUM|SFV=SKI|IPV=NLI|SRV=|SCL=-1|SCORE=0|LIST=0|DI=|RD=|H=PN2P287MB0673.INDP287.PROD.OUTLOOK.COM|CIP=|SFP=0|ASF=0|CTRY=|CLTCTRY=IPV6|LANG=en|LAT=1|LAT=0|LAT=1|FPR=A8C2707E.E93100B.89F093CD.D44EEEC9.20067|DIR=OUT, PCFA:SUM|URLRW=0, CompCost:C|ETR=37|SFA=0, DeliveryPriority:Normal, OriginalFromAddress:<>, AccountForest:INDP287A002.PROD.OUTLOOK.COM


Timestamp:2/22/2023 5:21:38 PM
EventId:SEND
Source:HTTP
MessageSubject:Test email for connector validation
MessageId:<email address removed for privacy reasons>
Recipients:email address removed for privacy reasons
RecipientCount:1
RecipientStatus:250 2.0.0 OK
SourceContext:
Sender:email address removed for privacy reasons
EventData:MsgRecipCount:1, IncludeInSla:True, ProcessedRC:1, ExpirationTimeV2:2/23/2023 5:21:36 PM, ExpirationStartTimeReason:OriginalSubmit, ExpirationIntervalReason:OriginalSubmit, DeliveredViaHttps:P2PDeliver, HttpRequestId:d78a2852-63b0-4e5e-be9d-86fca689ed39, MailboxDatabaseGuid:8abc0fee-00c5-483b-9eb3-4a195ba2a118, ResourceForest:INDP287.PROD.OUTLOOK.COM, DeliveryPriority:Normal, OriginalFromAddress:<>, AccountForest:INDP287A002.PROD.OUTLOOK.COM, E2ELatency:2.690


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