SourceContext: ExplicitilyDiscarded - Email Not Found

Hi,

I have an issue where emails sent from a scanner are showing "ExplicitilyDiscarded" and never arrive in the recipients mailbox.  I've checked the queue and had them run a few more tests and 1 server failed 2x, another server failed 1x and actually sent the email 1x.  I put the email in a whitelist but it still get's discarded with no other infromation

I attached the tracelog, is there anyway to identify why the mailbox server is dropping the email?  I've checked event viewer for application but not seeing any issues at first glance.  Any help is appreciated.

Mailbox Database Settings:
Outbound connection failure retry interval (seconds): 600

Transient failure retry interval (minutes): 5

Transient failure retry attempts:6

Trace Log:

unspaceId              : f0de1cb5-482c-47c8-ac4e-37d9d15368be
Timestamp               : 5/15/2019 12:25:49 PM
ClientIp                :
ClientHostname          : Server.cloud.com
ServerIp                :
ServerHostname          : ServerMB01
SourceContext           :
ConnectorId             :
Source                  : SMTP
EventId                 : HARECEIVE
InternalMessageId       : 55825984914137
MessageId               : <2019051512@corp.client.com>
Recipients              :{clientemail@client.com}
RecipientStatus         : {}
TotalBytes              : 10347
RecipientCount          : 1
RelatedRecipientAddress :
Reference               :
MessageSubject          : Attached Image
Sender                  :scanner@client.com
ReturnPath              :scanner@client.com
Directionality          : Incoming
TenantId                :
OriginalClientIp        :
MessageInfo             :
MessageLatency          :
MessageLatencyType      : None
EventData               : {[DeliveryPriority, None], [PrioritizationReason, ShadowRedundancy], [AccountForest,
                          cloud.com]}

RunspaceId              : f0de1cb5-482c-47c8-ac4e-37d9d15368be
Timestamp               : 5/15/2019 12:26:02 PM
ClientIp                :
ClientHostname          :
ServerIp                :
ServerHostname          : ServerMB01
SourceContext           : ExplicitlyDiscarded
ConnectorId             :
Source                  : SMTP
EventId                 : HADISCARD
InternalMessageId       : 55825984914137
MessageId               : <201905147@corp.client.com>
Recipients              :{clientemail@client.com}
RecipientStatus         : {}
TotalBytes              : 10347
RecipientCount          : 1
RelatedRecipientAddress :
Reference               :
MessageSubject          : Attached Image
Sender                  :scanner@client.com
ReturnPath              :scanner@client.com
Directionality          : Incoming
TenantId                :
OriginalClientIp        :
MessageInfo             :
MessageLatency          :
MessageLatencyType      : None
EventData               : {[DeliveryPriority, None], [PrioritizationReason, ShadowRedundancy], [AccountForest,
                          cohere-cloud.com]}