Good morning
I set up the email from the same provider where the site is set up and when I try to test the email I get this error as shown below:

_This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

ufficio.it@****.com
host outbound.mailspamprotection.com [..*.37]
SMTP error from remote mail server after end of data:
550 Messages should have one Date header, not 2.
Reporting-MTA: dns; gnld1015.siteground.eu

Action: failed
Final-Recipient: rfc822;ufficio.it@***.com
Status: 5.0.0
Remote-MTA: dns; outbound.mailspamprotection.com
Diagnostic-Code: smtp; 550 Messages should have one Date header, not 2.
Oggetto osTicket test email
Mittente No reply HSEQ
Destinatario ufficio.it@****.com
Data Oggi 09:19_

and in the Header I found two date:

Return-path: <hseq@****.com>
Received: from [...108] (port=57578 helo=localhost)
by gnld1015.siteground.eu with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
(Exim 4.96)
(envelope-from <hseq@****.com>)
id 1oiuMs-000KYf-0d
for ufficio.it@**.com;
Thu, 13 Oct 2022 09:19:06 +0000
Date: Thu, 13 Oct 2022 09:19:06 +0000
Subject: =?UTF-8?Q?osTicket=20test=20email?=
Date: Thu, 13 Oct 2022 09:19:06 +0000
Message-ID: =?UTF-8?Q?<BtTbNAc-Lgh=5FF-AAAAAAAAAAAAAAAAP28GcmaG-hseq@*****.com>?=
X-Mailer: =?UTF-8?Q?osTicket=20Mailer?=
To: ufficio.it@**.com
From: =?utf-8?Q?No=20reply=20HSEQ?= <hseq@**.com>
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="=_4ff4758179c5640efc372dc13926c0da"
SG-Abuse: user, USERNAME=u907-dhgvzsz877a4 SENDER_HOST=...108 MAIL=hseq@*******.com

Someone can Help me please?

    19 days later

    KevinTheJedi Please describe how to perform the recursive search, because this post is the first hit in Google Search, and using the search term "550 Messages should have one Date header, not 2." using the Search Forum also lists this as the first hit and only hit that matches the query exactly.

      12 days later

      All of a sudden, I'm having this same issue. Where is the answer? I don't understand the Github thread? This issue has basically made my ticket system unusable for most of my clients.

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