Plesk Mail forwarding Problem. Need Help

[easyrahil]

Hello All Members.
I am having issue with my Plesk hosting. It is not forwarding my webforms and website notification to desired email addresses.
So I created Webmail to forward the results to specified e mail addresses and it worked for few months but since 2 months it all stopped and blocked by Gmail. error message is here:

This is the mail system at host plesk.cheapohosting.com.

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

<[email protected]>: host gmail-smtp-in.l.google.com[173.194.76.27] said:
    550-5.7.26 Unauthenticated email from gmail.com is not accepted due to
    domain's 550-5.7.26 DMARC policy. Please contact the administrator of
    gmail.com domain 550-5.7.26 if this was a legitimate mail. Please visit
    550-5.7.26  https://support.google.com/mail/answer/2451690 to learn about
    the 550 5.7.26 DMARC initiative.
    g13-20020adff3cd000000b003112a5f1813si8690104wrp.1048 - gsmtp (in reply to
    end of DATA command)
Reporting-MTA: dns; plesk.cheapohosting.com
X-Postfix-Queue-ID: BC85FC40BE8
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Fri, 30 Jun 2023 06:04:52 +0200 (CEST)

Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.7.26
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.26 Unauthenticated email from gmail.com is not
    accepted due to domain's 550-5.7.26 DMARC policy. Please contact the
    administrator of gmail.com domain 550-5.7.26 if this was a legitimate mail.
    Please visit 550-5.7.26  https://support.google.com/mail/answer/2451690 to
    learn about the 550 5.7.26 DMARC initiative.
    g13-20020adff3cd000000b003112a5f1813si8690104wrp.1048 - gsmtp
From     ChitchatX
To     [email protected]
Date     Today 09:34
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New Contact Message

From: amit

Email: [email protected]
Message:

next day test

ALso I have added SPF records in DNS settings but still failure is there. Hosting guys not so helpful. Perhaps they dont know anything. If anyone can help or solution.