Reporting-MTA: dns;v-exch-fe04.dtekgroup.tek.loc
Received-From-MTA: dns;v-xdr-ei04.dtekgroup.tek.loc
Arrival-Date: Tue, 23 Jun 2026 16:08:49 +0000

Original-Recipient: rfc822;xxxxxxxx@xxxx.xxx
Final-Recipient: rfc822;xxxxxxxx@xxxx.xxx
Action: failed
Status: 5.7.134
Diagnostic-Code: smtp;550 5.7.134 RESOLVER.RST.SenderNotAuthenticatedForMailbox; authentication required; Delivery restriction check failed because the sender was not authenticated when sending to this mailbox
X-Display-Name:
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