Email sending failure

Email sending failure

Dear Zoho Support Team,

I hope this message finds you well. Apologies for the inconvenience, but I need your assistance with an ongoing issue.

Yesterday, I was unable to reply to one of my clients whose email is hosted by ProtonMail (proton.me). Upon investigation, I discovered that my domain had been blacklisted by Spamhaus. I promptly addressed this issue with them, provided proof that the listing was a mistake, and they have since removed my domain from their blacklist.

However, despite this resolution, I am still encountering the same bounce-back issue when attempting to respond to my client’s email. Below are the current SPF records for my domain: v=spf1 include:zoho.com ~all


Also here is the error reports 
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.

xxxxxxxx@proton.me, ERROR CODE :554 - 5.2.1 Too many failures for the recipient



Reporting-MTA: dns; mx.zohomail.com
Arrival-Date: Sun, 13 Oct 2024 11:09:42 +0200

Original-Recipient: rfc822; xxxxxxx@proton.me
Final-Recipient: rfc822; xxxxxxx@proton.me
Status: 554
Action: failed
Last-Attempt-Date: 13 Oct 2024 09:09:47 GMT
Diagnostic-Code: 5.2.1 Too many failures for the recipient


Received:from mail.zoho.com by mx.zohomail.com
    with SMTP id 1728810582922135.48162122644794; Sun, 13 Oct 2024 02:09:42 -0700 (PDT)
Message-ID:<192852402e0.f6df3dbd28815.6915856235565997272@mydomain.org>
Date:Sun, 13 Oct 2024 11:09:42 +0200
From:Wise Bond Financials <xxxxxx@mydomain.org>
To:"Ascutney21" <xxxxxx@proton.me>
Subject:Re: Today is Day 7
Content-Type:multipart/alternative;
    boundary="----=_Part_87742_6127787.1728810582754"
User-Agent:Zoho Mail


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