Zoho Mail Not Delivering: Updated 2026 Guide

I use Zoho Mail for daily communication, so when I faced Zoho Mail not delivering emails, it became an obstacle in my workflow. Over a period of time, I have learned that these issues get triggered by misconfigurations and server-side restrictions rather than the mail service itself, similar to situations like Zoho Mail vs Gmail.

Most users also face the issue where Zoho Mail not sending emails don’t work seamlessly or where Zoho Mail can send but not receive messages at all. I have created this article to break down all the causes and practical solutions.

Common Reasons Why Zoho Mail Emails Are Not Delivered

While analyzing why Zoho Mail not delivering emails, I found out these common reasons behind it:

• DNS records are missing or set incorrectly like SPF, DKIM, or MX
• Emails are going to spam because of the email content or attachments
• Zoho servers are under maintenance or an outage is going on
• Storage limit has been exceeded and related to the Zoho Mail storage limit.
• The IP address has been blacklisted or the domain have poor reputation
• There can be some restrictions on the recipient’s mail server\

In most of these cases, users think Zoho Mail not sending emails, but the reason is that messages are blocked or rejected. Some setups can also result in Zoho Mail can send but not receive emails due to server errors.

Go-To Checks Before Getting Started

Whenever I encounter Zoho Mail not delivering messages, these are some checks thet come first in my mind:

• Firstly, I check if the Zoho Mail is working properly or if there is any outage from their end
• Check the mailbox storage and if it is full then clear up some space
• Make sure you are entering the right credentials and also check if the account has permission
• Try sending emails to different domains to confirm whether they are working or not

Most of the time these basic fixes resolve Zoho Mail not sending issues without advanced troubleshooting. If emails are sent but you are not receiving anything, then it indicates Zoho Mail can send but not receive problems linked to incoming mail settings and seen while how to create a new Zoho email account.

Email Authentication Issues That Affect Delivery

One of the most common reasons behind Zoho Mail not delivering emails is failed authentication. Here are some settings that are critical:

• SPF Record: It can confirm if Zoho Mail servers are allowed to send emails for your domain.
• DKIM Signature: It adds a digital signature that verifies email integrity
• MX Records: It navigates incoming emails to Zoho Mail servers correctly

If any of these records are misconfigured than it results in:

• Some recipients’ servers may refuse to accept your emails
• Emails may end up in spam folders
• Users can experience Zoho Mail not sending erros for some domains
• You may be able to send emails but incoming emails fail and lead to Zoho Mail can send but not receive 

Spam Filters and Block List Problems

Spam protection can play a vital role in Zoho Mail not delivering emails. I have seen most of the legitimate emails getting banned because of aggressive filtering. Here are some spam-related issues:

• Some subject lined that look suspicious or fraudulent
• Attachments that have formats that are not supported and are too large
• Emails that contain too many links or images
• The recipient’s email settings or blocklist are stopping the message

The incorrect filter that rules inside Zoho Mail can:

• Delete incoming emails automatically
• Moving email folders without any notification\
• Make it seem like Zoho Mail is not sending emails, even though it is not what is happening
• Situations like Zoho Mail can send emails but doesn’t receive them properly can get created, similar to Zoho Mail not printing emails issues.

Email Content and Attachment Limitations

Content quality can be the reason behind delivery success. While dealing with Zoho Mail not delivering issues there are some points to look for:

• Attachments that are larger than the size which is allowed
• Compressed files blocked due to security reasons
• Emails that contain too much text not enough images
• Subject lines that may sound promotional

When user faces this issue, they think that Zoho mail not sending, but the main problem is with the message structure. Attachments related failures can also make it seem like Zoho Mail can send but not receive files properly.

Network, Firewall, and Device-Level Issues

Most of the time user assume that all Zoho Mail not delivering problems are server-related but this is far from the truth. Some of the issue can happen because of local systems:

• Sometimes the issue can be triggered by the firewall and antivirus as they may be blocking the SMTP or IMAP ports
• The incoming and outgoing mail server port settings are wrong
• User is using an older version of the email client or Zoho Mail app
• Cache and sync problems on mobile devices can trigger this issue

These issues can lead to Zoho Mail not sending emails from desktop clients, while the mobile app still shows Zoho Mail can send but not receive due to sync delays.

Why Email Backup Matters During Delivery Issues

While working on Zoho Mail not delivering problems, I have noticed that email safety is as important because these kinds of situations can lead to missing emails. That’s the reason I rely on a professional and reliable tool like the SysTools Zoho Mail Backup Tool,

as it allows:

• Safely back up Zoho Mail emails and attachments locally
• Prevent data loss from accidental deletion
• Users are able to restore emails easily even if there are server or delivery problems
• The user can store the emails for the long term 
• Helps in backing up the emails in multiple formats like PST, PDF, EML, MBOX, and MSG

Zoho Mail not sending can interrupt your workflow and focusing on it can be a waste of time; instead, you can go for a backup option where you can access your emails even in this kind of situation. It is also helpful in recovering data in situations where Zoho Mail can send but not receive emails temporarily.

Author’s Verdict

Personally, I realised that Zoho Mail not delivering emails is usually caused by configuration or filtering issues. Most of the time the issue gets resolved by fixing authentication, spam filters, and network settings.

Understanding why Zoho Mail not sending messages helps in going with the right approach to fix the issue. Also identifying why Zoho Mail can send but not receive emails make sure incoming communication remains uninterrupted.

FAQs

Q. Is there any problem with Zoho as it is not sending emails from my email client?

No, it may be possible that it can happen because of incorrect SMTP settings or blocked ports.

Q. Is there a way to protect emails from Zoho Mail not delivering issues?

Yes, backing up your emails using backup solutions like SysTools Zoho Backup Tool help to secure email.

Q. Can email content be the reason behind Zoho Mail not sending?

Yes, large attachments and spam-like content can trigger filters and lead to this issue.

Q. Is it true that the full mailbox storage causes Zoho Mail to not send problems?

Yes, as a full mailbox can prevent new messages from coming.