Merhaba şirket içinde birbirimize mail gönderirken böyle bir mail geri dönüyor.
Aşağıdaki gibi hata alıyorum sorun nedir ?

This is the mail system at host relay.mailchannels.net.



I'm sorry to have to inform you that your message could not

be delivered to one or more recipients. It's attached below.



For further assistance, please send mail to postmaster.



If you do so, please include this problem report. You can

delete your own text from the attached returned message.



                   The mail system



<mail-adresi1@alanadim.com>: host mx2.titan.email[54.xxx.xx.xx] said: 554

    5.7.1 <mail-adresi1@alanadim.com >: Relay access denied (in reply to

    RCPT TO command)



<mail-adresi2@alanadim.com>: host mx2.titan.email[54.xxx.xx.xx ] said: 554

    5.7.1 <mail-adresi2@alanadim.com>: Relay access denied (in reply to RCPT

    TO command)



<mail-adresi3@alanadim.com >: host mx2.titan.email[54.xxx.xx.xx ] said: 554

    5.7.1 <mail-adresi3@alanadim.com >: Relay access denied (in reply to

    RCPT TO command)

Reporting-MTA: dns; relay.mailchannels.net

X-Postfix-Queue-ID: 16354681582

X-Postfix-Sender: rfc822; benim-mail-adresim@alanadim.com

Arrival-Date: Fri,  1 Oct 2021 09:07:43 +0000 (UTC)



Final-Recipient: rfc822; mail-adresi1@alanadim.com

Original-Recipient: rfc822;mail-adresi1@alanadim.com

Action: failed

Status: 5.7.1

Remote-MTA: dns; mx2.titan.email

Diagnostic-Code: smtp; 554 5.7.1 <mail-adresi1@alanadim.com >: Relay access

    denied



Final-Recipient: rfc822; mail-adresi2@alanadim.com

Original-Recipient: rfc822;mail-adresi2@alanadim.com

Action: failed

Status: 5.7.1

Remote-MTA: dns; mx2.titan.email

Diagnostic-Code: smtp; 554 5.7.1 <mail-adresi2@alanadim.com >: Relay access

    denied



Final-Recipient: rfc822; mail-adresi3@alanadim.com

Original-Recipient: rfc822;mail-adresi3@alanadim.com

Action: failed

Status: 5.7.1

Remote-MTA: dns; mx2.titan.email

Diagnostic-Code: smtp; 554 5.7.1 <mail-adresi3@alanadim.com >: Relay access

    denied

Return-Path: <benim-mail-adresim@alanadim.com >

Received: from relay.mailchannels.net (localhost [127.0.0.1])

    by relay.mailchannels.net (Postfix) with ESMTP id 16354681582;

    Fri,  1 Oct 2021 09:07:43 +0000 (UTC)

Received: from gcp-europe-west2-c-smtpout1.hostinger.io (100-96-18-141.trex.outbound.svc.cluster.local [100.xx.xx.xx])

    (Authenticated sender: hostingeremail)

    by relay.mailchannels.net (Postfix) with ESMTPA id 53479680B1B;

    Fri,  1 Oct 2021 09:07:41 +0000 (UTC)

X-Sender-Id: hostingeremail|x-authsender|benim-mail-adresim@alanadim.com

Received: from gcp-europe-west2-c-smtpout1.hostinger.io

 (160.117.246.35.bc.googleusercontent.com [35.246.117.160])

    (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256)

    by 100.96.18.141 (trex/6.4.3);

    Fri, 01 Oct 2021 09:07:42 +0000

X-MC-Relay: Neutral

X-MailChannels-SenderId:

 hostingeremail|x-authsender|benim-mail-adresim@alanadim.com

X-MailChannels-Auth-Id: hostingeremail

X-Society-Squirrel: 1044d0037b9ad4be_1633079262846_3868969659

X-MC-Loop-Signature: 1633079262846:1412115564

X-MC-Ingress-Time: 1633079262846

Received: from DESKTOPS58E5H8 (unknown [78.xxx.xx.xx])

    (Authenticated sender: benim-mail-adresim@alanadim.com )

    by smtp.hostinger.com (smtp.hostinger.com) with ESMTPA id 18B06408CEF2;

    Fri,  1 Oct 2021 09:07:36 +0000 (UTC)

DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=alanadim.com;

    s=hostingermail-a; t=1633079259;

    bh=ScGKKoqPvFADhw+w6bzOW1qzpjESwemByjGvYNSh5So=;

    h=From:To:Cc:Subject:Date;

    b=Yv1cgqs8jB85YwbP4uatxkuOQb6zIrQ5yIfl+/Ddw2th90M4QLb91AO+Y2AorcM0e

     CQAwFeLfkAn/Po16ens2PR9fp2vjHT/qaYLouj2ZM2EUQosUPT9NYePqE3yyANClAW

     D64R17CBu5IE8uUEwk4Mb31hKu/H1mjFcXMqtbuNLWlp6CqgMwAx3eQZBZQ4rd9Fq0

     LDzWCPd9Mptuvgs19HCu75oJBq/RnPtQJwm/+M/vr8y95URsgKI9aEAn9PI+YrNqOp

     DxMgfN6fadtGyWFHVo5GRcAwGFVRa665Go2pKOpFbh2N0e7G/mnq/ZMCUcNrDseWf+

     Pc7ToYaTCQCQA==

From: <benim-mail-adresim@alanadim.com>

To: <mail-adresi1@alanadim.com >

Cc: <mail-adresi2@alanadim.com >,

    =?iso-8859-9?Q?Ahmet_=Erol= <mail-adresi3@alanadim.com >

Subject: =?iso-8859-9?B?R0FOQSAtIN1a3U4=?=

Date: Fri, 1 Oct 2021 12:07:36 +0300

Message-ID: <028901d7b6a3$c89e6ff0$59db4fd0$@alanadim.com>

MIME-Version: 1.0

Content-Type: multipart/mixed;

    boundary="----=_NextPart_000_028A_01D7B6BC.EDEE18F0"

X-Mailer: Microsoft Outlook 16.0

Thread-Index: Ade2o7uhhMN24P07ToyC+73T9dQYfw==

Content-Language: tr