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External MTAs reject our auto-replies

We have recently updated from Exchange 2010 to Exchange 2013. Auto-reply messages work internally, fail to outside addresses. This is true for all users, and whether set through OWA or PowerShell.

If I check

> Get-RemoteDomain | fl DomainName,*OOF*,*enabled* (as recommended in a recent thread), I get:

DomainName                        : *
AllowedOOFType                    : External
AutoReplyEnabled                  : True
AutoForwardEnabled                : True
DeliveryReportEnabled             : True
NDREnabled                        : False
MeetingForwardNotificationEnabled : False
TNEFEnabled                       :
TrustedMailOutboundEnabled        : False
TrustedMailInboundEnabled         : False
NDRDiagnosticInfoEnabled          : True

In addition, when I search the Message Tracking log (using Get-MessageTrackingLog) for one of my messages, I get the following:

RunspaceId              : 812ecd7c-4aa8-4856-8d5d-288f0e80784f
Timestamp               : 12/16/2014 10:57:18 AM
ClientIp                : [my ip]
ClientHostname          : [my server]
ServerIp                : 98.136.216.25
ServerHostname          : mta6.am0.yahoodns.net
SourceContext           : 08D1E7712A377076
ConnectorId             : [my server] to Internet
Source                  : SMTP
EventId                 : FAIL
InternalMessageId       : 833223655525
MessageId               : <a16ca9125c8146f6934aa0fd943d3b5e@[my domain]>
Recipients              : {[my test account]@yahoo.com}
RecipientStatus         : {[{LRT=};{LED=550 Requested action not taken: mailbox
                          unavailable};{FQDN=};{IP=}]}
TotalBytes              : 4011
RecipientCount          : 1
RelatedRecipientAddress :
Reference               :
MessageSubject          : Automatic reply: Test3
Sender                  : test.user@[my domain]
ReturnPath              : <>
Directionality          : Originating
TenantId                :
OriginalClientIp        :
MessageInfo             : 2014-12-16T18:56:41.100Z;SRV=[my server]:TOTAL=0;SRV=[my server]:TOTAL=36|QDE=36
MessageLatency          :
MessageLatencyType      : None
EventData               : {[E2ELatency, 37], [ExternalSendLatency, 0],
                          [Microsoft.Exchange.Transport.MailRecipient.RequiredTlsAuthLevel,
                          Opportunistic], [DeliveryPriority, Normal]}

It's the same generic 550 from any external MTA that I've tried so far. Since I'm getting the response from (for example) mta6.am0.yahoodns.net, I think my auto reply is making it outbound past my firewall and actually getting rejected by yahoo (gmail, etc.).

I would appreciate any advice. Thanks.


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