Failed messages to vzwpix

[ArghGrrrr]

I have been sending email messages from Outlook via my in-house Exchange server for years to <<mynumber>>@vzwpix.com .  These messages typically have .WAV files attached for voice mail messages.  Recently these messages stopped getting through.   After a couple days I get a bounce message, which I'll include farther down.

Emails from my exchange server to <<mynumber>@vtext.com are getting through successfully.  But - those are SMS and can't include attachments, so no WAV file.

Emails from my GMAIL account to <<mynumber>>@vzwpix.com are getting through, including attachments.

So... vzwpix is still there, I just can't get messages from my Exchange server through any more.  

I send my outbound mail thru a relay service.  I have also tested sending this directly from my Exchange server.  No joy.

Any thoughts?

The bounce message that comes back is:

Delivery has failed to these recipients or groups:

Dave Cell Phone TXT ([email address removed per the Verizon Terms of Service])
The server has tried to deliver this message, without success, and has stopped trying. Please try sending this message again. If the problem continues, contact your helpdesk.

Diagnostic information for administrators:

Generating server: myexchange.xxxx.com
Receiving server: vzwpix.com (35.169.108.175)

[email address removed per the Verizon Terms of Service]
5/5/2025 6:05:35 PM - Remote Server at vzwpix.com (35.169.108.175) returned '550 4.4.7 QUEUE.Expired; message expired'
5/5/2025 6:00:34 PM - Remote Server at vzwpix.com (35.169.108.175) returned '451 4.4.0 Error encountered while communicating with primary target IP address: "421 4.2.1 Unable to connect." Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts. The last endpoint attempted was 35.169.108.175:587'

Original message headers:

Received: from myexchange.xxxxxx.com (192.168.0.212) by myexchange.xxxxxx.com (192.168.0.212) with Microsoft SMTP Server (TLS) id 15.0.1497.48; Sat, 3 May 2025 14:02:41 -0400Received: from W2K12A.arctools.com ([::1]) by myexchange.xxxxxx.com ([fe80::xxxx]) with Microsoft SMTP Server id 15.00.1497.048; Sat, 3 May 2025 14:02:41 -0400From: "Ralph Kramden" <[email address removed per the Verizon Terms of Service]>To: Dave Cell Phone TXT <[email address removed per the Verizon Terms of Service]>Subject: FW: [YoLink] Device Alarm : FL GDOThread-Topic: [YoLink] Device Alarm : FL GDOThread-Index: AQHbvFWQNbHTUjZgFk6dKb9JzxUZo7PBMnWkDate: Sat, 3 May 2025 18:02:41 +0000Message-ID: <[email address removed per the Verizon Terms of Service]>References: <[email address removed per the Verizon Terms of Service]>In-Reply-To: <[email address removed per the Verizon Terms of Service]>X-MS-Has-Attach: yesX-MS-Exchange-Inbox-Rules-Loop: [email address removed per the Verizon Terms of Service]-MS-TNEF-Correlator:x-ms-exchange-transport-fromentityheader: Hostedx-ms-exchange-parent-message-id: <[email address removed per the Verizon Terms of Service]>auto-submitted: auto-generatedx-ms-exchange-generated-message-source: Mailbox Rules AgentContent-Type: multipart/mixed;        boundary="_002_a7b3512477364e3a88d39cd1e060c497W2K12Aarctoolscom_"MIME-Version: 1.0

[vzw_customer_support]

ArghGrrrr, thank you for sharing your concern about being unable to send emails to specific contacts. Let me send you a Private Message to ensure we can look in to this and provide you with support and clarification. 

-Art