Email - Error 550 [GELÖST]

[User__]

Hallo,
Ich verwalt meine Emails bei KeyHelp, und es Funktioniert auch eigentlich alles Reibungslos aber wenn ich eine Email an eine Gmail schreibe kommt immer das:

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This is the mail system at host admin.code-learning.de.

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

<haensel.ja08@gmail.com>: host gmail-smtp-in.l.google.com[173.194.76.26] said:
    550-5.7.26 This message does not have authentication information or fails
    to 550-5.7.26 pass authentication checks. To best protect our users from
    spam, the 550-5.7.26 message has been blocked. Please visit 550-5.7.26
    https://support.google.com/mail/answer/81126#authentication for more 550
    5.7.26 information. s25si22337639wrb.389 - gsmtp (in reply to end of DATA
    command)
Reporting-MTA: dns; admin.code-learning.de
X-Postfix-Queue-ID: 2356AA1421
X-Postfix-Sender: rfc822; jannik-h@code-learning.de
Arrival-Date: Wed, 17 Jun 2020 14:12:48 +0200 (CEST)

Final-Recipient: rfc822; haensel.ja08@gmail.com
Original-Recipient: rfc822;haensel.ja08@gmail.com
Action: failed
Status: 5.7.26
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.26 This message does not have authentication
    information or fails to 550-5.7.26 pass authentication checks. To best
    protect our users from spam, the 550-5.7.26 message has been blocked.
    Please visit 550-5.7.26
    https://support.google.com/mail/answer/81126#authentication for more 550
    5.7.26 information. s25si22337639wrb.389 - gsmtp

Könnte mir da Jemand helfen?

[Mod-Edit]
Thread nach Fehler und Probleme verschoben.
Topic angepaßt.

[Jolinar]

Das dürfte vermutlich an einigen fehlenden RR liegen.

SPF-RR fehlt:

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;QUESTION
code-learning.de. IN TXT
;ANSWER

MX-RR fehlt:

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;QUESTION
code-learning.de. IN MX
;ANSWER

PTR für den Host fehlt:

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;QUESTION
15.183.142.45.in-addr.arpa. IN PTR
;ANSWER

Wenn dein Server IPv6 unterstützt, dann fehlen diesbezüglich auch sämtliche RRs.