This is now the second time I have had this issue with zoho mail filtering 2FA codes from outside services. Currently the problem is with and example of this email from OpenAI:
Authentication-Results: mx.zohomail.com;
dmarc=pass(p=reject dis=none) header.from=tm.openai.com
ARC-Seal: i=1; a=rsa-sha256; t=1750111890; cv=none;
d=zohomail.com; s=zohoarc;
b=K4+QWyW08UboS5ujqc7T6RHnuv9enkS11PZpL6Y7CPM/EbpNMx+ClFU9/RnoLcZ/Dpkv34TZzG+GNIlz4H4ZPsNsnWGWqjDX2rHHnwRymOdnKUkz27BuSER+/QXeMELTq7X31tXMHgEV24L879uhcEMRM23H9TP/ogjD/GrSsfY=
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc;
t=1750111890; h=Content-Type:Date:Date:From:From:MIME-Version:Message-ID:Subject:Subject:To:To:Message-Id:Reply-To:Cc;
bh=028s65f6zwgRWJQWzHKoR98LwxIuq8s3AwkhsZpW8Cw=;
b=m+pf0oL/H+r9gaZVMDzUHs78MZEINz00nQ8DtxnaI1UpeLaxQFrNfOszJ6sNNKf21kfsMQgI0GPHfBZTiX2XnUS/2dwWs3sux5YZ66/qMRj/03G/k/UK8balDN0gqDdWZZPFzpXHLqV1y/R7gn5M+JtcnFgWLxqExy593meh9Q0=
ARC-Authentication-Results: i=1; mx.zohomail.com;
Received: from mail136-218.atl41.mandrillapp.com (mail136-218.atl41.mandrillapp.com [198.2.136.218]) by mx.zohomail.com
with SMTPS id 1750111890910771.62273827185; Mon, 16 Jun 2025 15:11:30 -0700 (PDT)
Received: from pmta11.mandrill.prod.atl01.rsglab.com (localhost [127.0.0.1])
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Received: from [104.210.139.234] by mandrillapp.com id 985223b178a444c6b06ad93edd8f45ee; Mon, 16 Jun 2025 22:11:29 +0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mandrillapp.com;
s=mte1; t=1750111889; x=1750381889;
bh=028s65f6zwgRWJQWzHKoR98LwxIuq8s3AwkhsZpW8Cw=;
h=From:Subject:To:Feedback-ID:Message-Id:Date:MIME-Version:
Content-Type:CC:Date:Subject:From;
b=YN6zF7HaDtWPGJXTTcEp9dhYaiWtSBmURrxEYKUrjrHNI1CjjhBmMLgUex34sFnn+
kByHxACVxuAI0eaeX1fyxzSZA/PgcLh5hJSTD8jhGyYDo6SV8NV+wzbhZN1VfrT44T
dT4DUZG0UJij0DVJeEEqbhD/zPMPG5/0NXylbb4vtRQKY1v5f88eNn/U9JyPpa+5sh
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uSNVNHKrdHq8R+DryYImKovyhCLZHhydzJuAufaisuj8RHvoo7fWC7pn3ji97XixOP
MlDZWmuL274Mw==
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tm.openai.com;
bh=028s65f6zwgRWJQWzHKoR98LwxIuq8s3AwkhsZpW8Cw=;
h=From:Subject:To:Feedback-ID:Message-Id:Date:MIME-Version:
Content-Type:CC:Date:Subject:From;
b=i3Q2Zqp//lPh61oypBNPwE1tXSZD0TkwY1J0aciwxF+dpaOFS40QN4ji2WaE8dtEa
gzY0F5z2Z1LRg2rjFGP1oDuFFRM+tFgSzYdhXIaZaYWHzJLlgaxgiv+RcsJdJxMq4l
vxPIwZzYnBm4sp7K4ZSHY9CGdZEx7Qa9TVDmcdX5VJAk6JsdLuIZSH7tfdCYojzHKO
kdvoo7vn0IcX+J8A1fJq0UbXkgRJeBnRtqEkOWOZ0qXn7cdbbRr3HZEfj+4DUPDIR9
NCdx9Nq3CQ2Kp8rAYuekq7yva9oX/BLVHycgGpPrDSHccLCKs+IpCSjqorCaLcQjD+
KrFvbOPQyNnBQ==
Subject: =?utf-8?Q?Your=20ChatGPT=20code=20is=20970759?=
X-Native-Encoded: 1
X-Mandrill-User: md_31165340
Feedback-ID: 31165340:31165340.20250616:md
Message-Id: <31165340.20250616221129.68509691c94908.39206686@mail136-218.atl41.mandrillapp.com>
Date: Mon, 16 Jun 2025 22:11:29 +0000
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="_av-2ecyIt29BJq5i-YaWwSvFA"
--_av-2ecyIt29BJq5i-YaWwSvFA
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Your ChatGPT code is 970759 Enter this temporary verification
code to continue: 970759.
ChatGPT Log-in Code
Hi there,
We noticed a suspicious log-in on your account. If that was you, enter
this code:
= 970759 =
If you were not trying to log in to ChatGPT, please reset your password
For more information about why you received this email, please see the
help center article on One-Time Passwords
Best,
OpenAI
If you have any questions please contact us through our help
--_av-2ecyIt29BJq5i-YaWwSvFA
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: 7bit
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>Your ChatGPT code is 970759</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style type="text/css">
/**
* Google webfonts. Recommended to include the .woff version for cross-client compatibility.
*/
@media screen {
@font-face {
font-family: Colfax;
font-weight: normal;
}
@font-face {
font-family: Colfax;
font-weight: bold;
}
}
/**
* Avoid browser level font resizing.
* 1. Windows Mobile
* 2. iOS / OSX
*/
body,
table,
td,
a {
-ms-text-size-adjust: 100%; /* 1 */
-webkit-text-size-adjust: 100%; /* 2 */
font-family: Colfax, Helvetica, Arial, sans-serif;
}
/**
* Remove extra space added to tables and cells in Outlook.
*/
table,
td {
mso-table-rspace: 0pt;
mso-table-lspace: 0pt;
}
/**
* Better fluid images in Internet Explorer.
*/
img {
-ms-interpolation-mode: bicubic;
}
/**
* Remove blue links for iOS devices.
*/
a[x-apple-data-detectors] {
font-family: inherit !important;
font-size: inherit !important;
font-weight: inherit !important;
line-height: inherit !important;
color: inherit !important;
text-decoration: none !important;
}
/**
* Fix centering issues in Android 4.4.
*/
div[style*="margin: 16px 0;"] {
margin: 0 !important;
}
body {
width: 100% !important;
height: 100% !important;
padding: 0 !important;
margin: 0 !important;
}
/**
* Collapse table borders to avoid space between cells.
*/
table {
border-collapse: collapse !important;
}
a {
color: #10A37F;
}
img {
height: auto;
line-height: 100%;
text-decoration: none;
border: 0;
outline: none;
}
h1 {
font-size: 26px;
line-height: 1.4;
font-weight: 700;
margin: 0;
}
h2 {
font-size: 24px;
line-height: 1.4;
font-weight: 700;
margin: 0;
}
p {
margin: 0;
}
p + p {
margin-top: 16px;
}
</style>
</head>
<body style="background-color:#ffffff;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;font-family:Colfax, Helvetica, Arial, sans-serif;width:100% ;height:100% ;padding:0 ;margin:0 ;">
<div class="preheader" style="display: none; max-width: 0; max-height: 0; overflow: hidden; font-size: 1px; line-height: 1px; color: #fff; opacity: 0;">
Enter this temporary verification code to continue: 970759.
</div>
<!-- start body -->
<table border="0" cellpadding="0" cellspacing="0" width="100%" style="-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;font-family:Colfax, Helvetica, Arial, sans-serif;mso-table-rspace:0pt;mso-table-lspace:0pt;border-collapse:collapse ;">
<!-- start body block -->
<tr>
<td align="center" style="-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;font-family:Colfax, Helvetica, Arial, sans-serif;mso-table-rspace:0pt;mso-table-lspace:0pt;">
<!--[if (gte mso 9)|(IE)]>
<table align="center" border="0" cellpadding="0" cellspacing="0" width="600">
<tr>
<td align="center" valign="top" width="600">
<![endif]-->
<table border="0" cellpadding="0" cellspacing="0" width="100%" style="width:560px;background-color:#fff;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;font-family:Colfax, Helvetica, Arial, sans-serif;mso-table-rspace:0pt;mso-table-lspace:0pt;border-collapse:collapse ;">
<!-- header image -->
<tr>
<td valign="top" style="padding:27px 20px 24px 15px;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;font-family:Colfax, Helvetica, Arial, sans-serif;mso-table-rspace:0pt;mso-table-lspace:0pt;">
<table align="left" width="100%" border="0" cellpadding="0" cellspacing="0" style="min-width:100%;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;font-family:Colfax, Helvetica, Arial, sans-serif;mso-table-rspace:0pt;mso-table-lspace:0pt;border-collapse:collapse ;">
<tbody><tr>
<td valign="top" style="padding-top:0;padding-bottom:0;text-align:left;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;font-family:Colfax, Helvetica, Arial, sans-serif;mso-table-rspace:0pt;mso-table-lspace:0pt;">
</td>
</tr>
</tbody></table>
</td>
</tr>
<tr>
<td align="left" bgcolor="#ffffff" style="padding:16px 24px;font-size:32px;line-height:40px;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;font-family:Colfax, Helvetica, Arial, sans-serif;mso-table-rspace:0pt;mso-table-lspace:0pt;">
<p style="margin:0;">
ChatGPT Log-in Code
</p>
</td>
</tr>
<tr>
<td align="left" bgcolor="#ffffff" style="padding:16px 24px;font-size:16px;line-height:24px;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;font-family:Colfax, Helvetica, Arial, sans-serif;mso-table-rspace:0pt;mso-table-lspace:0pt;">
<p style="margin:0;">
Hi there,
</p>
<p style="margin:0;margin-top:16px;">
We noticed a suspicious log-in on your account. If that was you, enter this code:
</p>
<h1 style="font-size:26px;line-height:1.4;font-weight:700;margin:0;">970759</h1>
<p style="margin:0;">
</p>
<p style="margin:0;margin-top:16px;">
</p>
<p style="margin:0;margin-top:16px;">
Best,<br>
OpenAI
</p>
</td>
</tr>
</table>
<!--[if (gte mso 9)|(IE)]>
</td>
</tr>
</table>
<![endif]-->
</td>
</tr>
<!-- end body block -->
<!-- start footer -->
<tr>
<td align="center" style="padding:24px;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;font-family:Colfax, Helvetica, Arial, sans-serif;mso-table-rspace:0pt;mso-table-lspace:0pt;">
<!--[if (gte mso 9)|(IE)]>
<table align="center" border="0" cellpadding="0" cellspacing="0" width="600">
<tr>
<td align="center" valign="top" width="600">
<![endif]-->
<table border="0" cellpadding="0" cellspacing="0" width="100%" style="max-width:560px;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;font-family:Colfax, Helvetica, Arial, sans-serif;mso-table-rspace:0pt;mso-table-lspace:0pt;border-collapse:collapse ;">
<tr>
<td align="left" style="padding:4px 24px;font-size:14px;line-height:20px;color:#666;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;font-family:Colfax, Helvetica, Arial, sans-serif;mso-table-rspace:0pt;mso-table-lspace:0pt;">
</td>
</tr>
</table>
<!--[if (gte mso 9)|(IE)]>
</td>
</tr>
</table>
<![endif]-->
</td>
</tr>
<!-- end footer -->
</table>
<!-- end body -->
<div class="debug-string" style="display: none; max-width: 0; max-height: 0; overflow: hidden; font-size: 1px; line-height: 1px; color: #ececf1; opacity: 0;">
</div>
</html>
--_av-2ecyIt29BJq5i-YaWwSvFA--
Yes, I have checked the entire mailbox, this email is not filtered
Often the email arrives days later, sometimes the email never arrives.
No, the email is not in the spam folder.
Can you reach into your logs and determine what is happening here.