Unable to create exchange inbound exchange connector

[avdhut]

I am trying to create exchange in a way that it will redirect mail from O365 to my email server.
While creating I am getting some error while validating with the user that exists on email server. 
Mail server validation results :- 

250-a05b7644ea5a Hello mail-maxind01lp2177.outbound.protection.outlook.com [104.47.74.177], Poste.io is at your service 250-PIPELINING 250-8BITMIME 250-SMTPUTF8 250-SIZE 26214400 250 AUTH PLAIN LOGIN

Send test email validation: - 
ERROR 

550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient email address removed for privacy reasons not found by SMTP address lookup

Detailed log
Timestamp:3/2/2023 11:15:11 AM
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:08DB19C126E94EDC;2023-03-02T11:15:11.606Z;0
Sender:email address removed for privacy reasons
EventData:ProxyHop1:PN2PR01CA0047.outlook.office365.com(2603:1096:c01:22::22), MimeParts:Att/Emb/MPt:0/0/1, MessageValue:MediumHigh, Replication:PN0P287MB0088, InboundTlsDetails:TLS=SP_PROT_TLS1_2_SERVER TLSCipher=CALG_AES_256 TLSKeyLength=256 TLSKeyExAlg=CALG_ECDH_EPHEM, CorrelationId:fe339b23-1640-4108-df7b-08db1b0f63cf, FirstForestHop:PN3P287MB0081.INDP287.PROD.OUTLOOK.COM, FromEntity:Internet, DeliveryPriority:Normal, OriginalFromAddress:<>, AccountForest:INDP287A002.PROD.OUTLOOK.COM

Timestamp:3/2/2023 11:15:12 AM
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:NotFound.OneOff.Resolver.CreateRecipientItems.10
SourceContext:
Sender:email address removed for privacy reasons
EventData:SenderVerdict:NotFound.OneOff.Sender.10, DeliveryPriority:Normal, OriginalFromAddress:<>, AccountForest:INDP287A002.PROD.OUTLOOK.COM

Timestamp:3/2/2023 11:15:12 AM
EventId:BADMAIL
Source:DSN
MessageSubject:Test email for connector validation
MessageId:<email address removed for privacy reasons>
Recipients:email address removed for privacy reasons
RecipientCount:1
RecipientStatus:
SourceContext:
Sender:email address removed for privacy reasons
EventData:DeliveryPriority:Normal, OriginalFromAddress:<>, AccountForest:INDP287A002.PROD.OUTLOOK.COM, BadmailReason:Suppress NDR of a rejected or expired DSN

Timestamp:3/2/2023 11:15:12 AM
EventId:FAIL
Source:ROUTING
MessageSubject:Test email for connector validation
MessageId:<email address removed for privacy reasons>
Recipients:email address removed for privacy reasons
RecipientCount:1
RecipientStatus:[{LED=550 5.1.10 RESOLVER.ADR.RecipientNotFound; Recipient email address removed for privacy reasons not found by SMTP address lookup};{MSG=};{FQDN=};{IP=};{LRT=}]
SourceContext:
Sender:email address removed for privacy reasons
EventData:DeliveryPriority:Normal, OriginalFromAddress:<>, AccountForest:INDP287A002.PROD.OUTLOOK.COM, ToEntity:Unknown, FromEntity:Internet, IsDsn:False

[#2]

When creating a connector to on-prem, it will validate SMTP traffic by sending an e-mail to the recipient specified in the connector configuration dialog. That recipient needs to be accepted on-prem.