Strange Mails | WordPress.org

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We have an appointment hour booking calendar and we are receiving many error messages via e-mail. How can that be fixed? Thank you in advance for your efforts and responses. I have activated the antispam thing.

Example Error E-Mail:

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 failed:

    admin@emailadress:
        SMTP error from remote server for GREETING command, host: mx02.t-online.de (194.25.134.9) reason: 554 IP=82.165.159.38 - A problem occurred. (Ask your postmaster for help o
r to contact [email protected] to clarify.)

--- The header of the original message is following. ---

Received: from [217.72.192.67] ([217.72.192.67]) by mx.kundenserver.de
(mxeue112 [217.72.192.67]) with ESMTP (Nemesis) id 1M1Y1l-1ofJ053Bb1-0039nK
for <[email protected]>; Mon, 26 Sep 2022 16:19:47 +0200
Received: from mail.sadomog.cz ([78.142.25.5]) by mx.kundenserver.de (mxeue112
[217.72.192.67]) with ESMTP (Nemesis) id 1MZlpJ-1oibsj3BQN-00WjJq for
<[email protected]>; Mon, 26 Sep 2022 16:19:46 +0200
Received: from sadomog.cz (ocnober.mom [91.215.169.236])
    by mail.sadomog.cz (Postfix) with ESMTPA id 3EFE887F2;
    Mon, 26 Sep 2022 16:37:14 +0300 (EEST)
Message-ID: <64530761W04728844G45200020F61563065S@awsymzs>
Reply-To: "Skandalose Geheiminvestition" <[email protected]>
From: "Skandalose Geheiminvestition" <[email protected]>
To: <[email protected]>
Subject: =?utf-8?B?U2thbmRhbMO2c2UgR2VoZWltaW52ZXN0aXRpb24sIGRpZSBIdW5kZXJ0ZSBNZW5zY2hlbiBpbiBEZXV0c2NobGFuZCBzdGVpbnJlaWNoIG1hY2h0?=
Date: Mon, 26 Sep 2022 16:37:31 +0300
MIME-Version: 1.0
Content-Type: multipart/related;
    type="multipart/alternative";
    boundary="----=_NextPart_000_0006_01D8D1C3.D436AAD0"
X-Spam-Flag: YES
X-UI-Out-Filterresults: junk:10;V03:K0:m3bzH9z3pwY=:YiEW7ZafUgvZg/gHJPOdTgRZ
7aIjl86B+U50o1GVrkXAZCB+K9NrU6TB+NNQsQiAAAAOqdajaC8SMgkL1MBn9+OiyDwN6toKX
eqoZtNCP1mhxoLWelIeBpzVtsZq+F6wUmSCxGiuSbNGgL8ypMO/Qbt63kpolhdhiuX1BlrzI7
J9FEvmH4iH9Jaax6uqZ7Gfcxza6FG2CiBG6WYEuMCZfwqfgLVjRmFn9z1lTW67zlEvDRed2+L
et4wP+Zbb/uHtHxYRzcVwT09gkCtbqnuFlAWdY1m9mKdPH6Li1JqQQoQJA3OYXVihRowYFcK/
gT5vmRBmF1+8kIdgBaBGUAXmWxfxAPW22cMvDiYrG9p4vzREHPsE4jxz9nl7clHWbWnBq327B
DrJ1WL/N3pE6appuWmA2yM8gT+yzsAHVzbYvREQ9agL5swOG/65gyl2L6iBIwh25zn0BTpl/0
4H4YrULXE7Sn/tdFB608Kya8HskZ4gXmTQtqGRyEcPa94OYaaL/nX6sOrmSiEXMddVwpFbQD9
/P9gJhwvyqSnD1+1J6snX7a/od3sTeRYvj/+/Yo/ofUYd0Zy+v+4N8f7hJ9wKGcWM37UfTtr2
IVsJflEdDP9NXmWYGherOcTsx7hUy6wCCJulJzH1s2ivL+CiRm3FPDd+NLu528BrR0v3rszTW
NPPjYg/mgUXelWJTUeChunNupe7mcgZ+u6L6HFJ0KOaxg8tB271yqvNyZWI94FdoH2V0owGQ7
4EkbjNVeaEIQJO

The page I need help with: [log in to see the link]

 

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