Hello, my company is having issues sending emails to @aol.com and @yahoo.com
I made sure we're not listed on any spammer lists, I have an SPF and DMARC setup in my external DNS. Below is the NDR that I got back.
I tried to send an email to email@example.com, and this is what was returned to me.
Any idea's what is wrong?
Delivery has failed to these recipients or groups: firstname.lastname@example.org (email@example.com)
Several attempts to deliver your message were unsuccessful and we stopped trying.
It could be a temporary situation. Try to send your message again later.
Diagnostic information for administrators:
Generating server: exchange.mydomain.org
Receiving server: exchange.mydomain.org
Total retry attempts: 193
12/16/2021 5:01:16 PM - Server at exchange.mydomain.org returned '550 5.4.300 Message expired -> 451 4.4.395 Target host responded with error. -> 421 4.4.1 Connection timed out'
12/16/2021 8:48:58 AM - Server at mx-aol.mail.gm0.yahoodns.net (220.127.116.11) returned '451 4.4.395 Target host responded with error. -> 421 4.4.1 Connection timed out'
Original message headers:
Received: from exchange.mydomain.org (10.10.14.12) by
exchange.mydomain.org (10.10.14.12) with Microsoft SMTP Server
(version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id
15.2.922.13; Tue, 14 Dec 2021 09:11:25 -0800
Received: from exchange.mydomain.org ([::1]) by exchange.mydomain.org
([::1]) with mapi id 15.02.0922.013; Tue, 14 Dec 2021 09:11:25 -0800
From: Dan <firstname.lastname@example.org>
To: "email@example.com" <firstname.lastname@example.org>
Subject: test 2
Thread-Topic: test 2
Date: Tue, 14 Dec 2021 17:11:24 +0000