If you have tried sending an email from your business account and received an error saying that your email sending limit has been exceeded, your hosting account may have reached its permitted email sending allowance.
This problem can affect business owners, employees and website administrators who rely on email to communicate with customers, suppliers and colleagues. In some cases, legitimate email activity causes the limit to be reached. In others, a compromised mailbox, an infected website or an incorrectly configured application may be sending messages without your knowledge.
Understanding the cause is important because simply increasing the sending limit may not solve the underlying problem.
This guide explains what an email sending limit means in cPanel, why it can be exceeded, how to investigate the problem and what to do if hundreds of failed delivery notifications appear in your inbox.
What Does Email Sending Limit Exceeded Mean?
An email sending limit is a restriction on how many messages an account or hosting server can send during a specified period.
Hosting providers use sending limits to manage server resources, reduce spam and protect the reputation of their mail servers.
For example, a hosting account may have a limit on the number of outgoing email messages it can send within an hour. If the account reaches that limit, the server may temporarily prevent additional messages from being sent.
The exact limit depends on the hosting provider and the server configuration.
When the limit is exceeded, you may see an error containing wording such as:
- Email sending limit exceeded.
- Hourly sending limit exceeded.
- The domain has exceeded the maximum emails per hour.
- Outgoing mail has been temporarily restricted.
- Message rejected because the sending account has reached its permitted limit.
The precise error message matters because different restrictions can produce similar symptoms.
An hourly email limit is not necessarily the same as a mailbox quota, an SMTP authentication failure or a recipient’s rejection of a message.
Before changing your hosting settings, identify the exact error and determine which account or domain triggered it.
Why Does cPanel Email Sending Limit Get Exceeded?
There are several possible causes. The correct solution depends on which one applies to your account.
1. Your Business Is Sending Too Many Emails
A business may reach its sending limit when several employees send large numbers of messages within a short period.
For example, an organisation might send quotations, invoices, customer notifications and internal announcements throughout the day.
If the combined email activity exceeds the hosting account’s configured allowance, some messages may be delayed or rejected.
This does not automatically mean that the account is sending spam. It may simply mean that the current hosting plan is not suitable for the volume of email being sent.
However, before requesting a higher limit, confirm that all outgoing messages are legitimate and that no unexpected sending activity is taking place.
If the business regularly sends newsletters or promotional campaigns to large mailing lists, a dedicated email marketing platform may be more appropriate than ordinary hosting email.
2. Your Email Account May Have Been Compromised
One of the most important causes to investigate is unauthorised access to an email account.
If someone obtains your email password, they may use the account to send unsolicited messages to large numbers of recipients.
The account can then reach its sending limit, even when the legitimate user has sent very few emails.
Possible warning signs include unexpected delivery failure notifications, unfamiliar messages in the Sent folder, complaints from recipients or email restrictions that appear without an obvious explanation.
However, a large number of failed delivery notifications does not prove that an account has been hacked. Other causes are possible, including a misconfigured application or legitimate messages being rejected.
If you suspect a compromise, investigate promptly. Reset the affected mailbox password using a trusted device, review account access where available and check the server’s email logs.
If the hosting provider has temporarily suspended outgoing email, ask for the reason and the steps required to restore sending privileges.
Do not simply increase the sending limit when there is evidence of unauthorised activity. That could allow the underlying problem to continue at a greater scale.
3. A Website or Application Is Sending Emails Automatically
Websites frequently send automated emails.
A WordPress website might send password-reset messages, contact-form notifications, customer receipts or order confirmations. A custom application might send alerts, account verification messages or scheduled reports.
If an application is misconfigured, compromised or repeatedly retrying failed operations, it may generate far more messages than expected.
For example, a faulty contact form could send repeated notifications, or malicious code could attempt to send unsolicited email through the hosting account.
To investigate, identify the scripts and applications that use the affected email service.
Check recent website changes, installed plugins, scheduled tasks and application logs. If you discover suspicious code or unexpected email activity, investigate the security of the website before restoring normal sending.
Where possible, configure applications to use a properly authenticated mail service and apply sensible limits to automated notifications.
4. A Large Number of Messages Are Being Retried or Rejected
A sending limit can also be reached when messages are repeatedly attempted or when an application generates a large volume of mail that cannot be delivered successfully.
For example, an application may send messages to outdated addresses, or an automated process may repeatedly attempt delivery after a failure.
The resulting delivery notifications can make the problem appear worse because the account may generate additional messages about the original failures.
Review the mail logs to determine whether messages are being accepted, rejected, deferred or repeatedly retried.
Look for patterns involving the same sender, recipient, application or time period.
If many messages are failing for the same reason, correcting the underlying configuration may be more effective than changing the sending limit.
5. Your Hosting Plan Has a Restrictive Email Allowance
Some hosting plans are designed for ordinary business correspondence rather than high-volume email delivery.
A small business may have no problems sending normal customer communications but encounter restrictions when several employees begin sending more messages than usual.
If the activity is legitimate and your account is correctly configured, you may need a hosting or email service that better matches your requirements.
Before upgrading, confirm the provider’s current limits, how they are calculated and whether the restriction applies per mailbox, domain or hosting account.
Do not assume that purchasing more disk space automatically increases the permitted email sending volume. Storage limits and sending limits are separate settings.
How to Fix Email Sending Limit Exceeded in cPanel
If your email has stopped working because a sending limit was reached, follow these steps to identify the cause and resolve it.
Step 1: Identify the Exact Error Message
Start by recording the complete error message returned by your email application or mail server.
If the message mentions an hourly sending limit, investigate the account’s outgoing email activity.
If it refers to authentication, check the username, password and SMTP configuration.
If it says that the recipient does not exist or cannot accept messages, investigate the recipient address and the specific delivery failure.
These errors require different solutions, so avoid changing unrelated settings before understanding the message.
If multiple employees are affected, determine whether the problem is limited to one mailbox or affects the entire hosting account.
Step 2: Check Email Delivery Information in cPanel
Log in to your hosting account and open cPanel.
Look for Track Delivery under the Email section, if the feature is available to your account.
Track Delivery can help you investigate email delivery attempts by showing relevant message information and delivery status.
Depending on the available information and your permissions, you may be able to identify messages that were accepted, rejected or encountered delivery problems.
Use the results to establish whether the failures involve a particular sender, recipient or time period.
If Track Delivery is unavailable, ask your hosting provider to inspect the relevant mail logs. Some troubleshooting information is available only to the server administrator.
Do not assume that the absence of Track Delivery means the email server is not recording delivery activity.
Step 3: Investigate Unexpected Outgoing Email
If the account appears to have sent hundreds of messages unexpectedly, treat the situation as a potential security incident until the activity has been explained.
Review the available delivery records and look for unusual patterns.
Questions to investigate include:
- Which email address sent the messages?
- When did the sending activity begin?
- Were the messages sent through SMTP, a website script or another application?
- Are the recipients familiar?
- Were the messages legitimate business communications?
- Is the sending activity still continuing?
If the logs identify a specific mailbox, reset its password and review its configuration.
If a website script or application appears responsible, investigate the application and its security before allowing it to continue sending.
If you cannot determine the source, contact your hosting provider and request assistance identifying the sending process.
Step 4: Secure the Affected Email Account
If unauthorised sending is suspected, take steps to secure the account.
Change the affected mailbox password to a strong, unique password. If the same password was used elsewhere, change it on those services as well.
Review available account access information and remove access that is no longer required.
Where supported, enable multifactor authentication for relevant accounts, particularly administrative accounts.
If several mailboxes may be affected, investigate each one rather than assuming that securing a single account resolves the entire incident.
Also check whether the affected email credentials are stored in website scripts, email applications or other services. Update those configurations securely when the password changes.
If the hosting provider has blocked outgoing mail because of suspicious activity, ask what evidence or checks are required before sending can resume.
Step 5: Check Your Website for Suspicious Activity
If the mail logs suggest that messages originated from a website, inspect the website’s applications and configuration.
For WordPress websites, review recently installed plugins, unfamiliar administrator accounts, unexpected changes and other signs of compromise.
Update WordPress, themes and plugins using trusted sources, and remove components that are no longer required.
If you suspect malicious code, consider obtaining professional security assistance rather than deleting unfamiliar files without understanding their purpose.
Also review contact forms and automated notifications. Confirm that they are not generating repeated messages because of a configuration error or abuse.
If the website has been compromised, removing the visible symptoms without addressing the underlying vulnerability may allow the problem to return.
Step 6: Ask Your Hosting Provider to Review the Sending Limit
Once you have investigated the activity and addressed any security concerns, contact your hosting provider if the account remains restricted.
Provide the exact error message, the affected domain, the approximate time the problem started and any relevant delivery information.
Ask the provider to confirm:
- The applicable outgoing email limit.
- Whether the limit applies to a mailbox, domain or hosting account.
- Which account or process triggered the restriction.
- Whether the restriction is temporary or requires administrator intervention.
- What must be done before outgoing email can be restored.
- Whether your current plan is appropriate for your normal email volume.
If your business has a legitimate need to send more messages, discuss suitable alternatives with the provider.
A higher limit may be appropriate in some cases, but the provider should first establish that the sending activity is legitimate and that the proposed change is consistent with its email policies.
Step 7: Test Email After the Problem Is Resolved
After the provider confirms that the issue has been resolved, test both incoming and outgoing email.
Send a test message to an address you control and confirm that it arrives.
Reply to the message and verify that the response reaches the original mailbox.
If your website sends automated emails, test the relevant forms or notifications as well.
Monitor the account for unusual sending activity. If the same restriction returns quickly, investigate further rather than repeatedly requesting a reset.
What Should You Do If Hundreds of Mail Delivery Failure Notifications Appear?
A large number of delivery failure notifications can be confusing, especially when they arrive in rapid succession.
These messages are commonly called bounce messages or bounce notifications. They report that an attempted email could not be delivered or that delivery encountered a problem.
If hundreds appear unexpectedly, do not assume that every message was generated by something you deliberately sent.
There are several possibilities.
Your mailbox or website may be sending legitimate messages to invalid addresses. A script may be generating excessive email. An account may have been compromised. Alternatively, someone may be sending messages that impersonate your address, causing some delivery failures to be directed to you.
The correct response is to identify the source.
First, check whether the affected mailbox contains unexpected messages in its Sent folder. Remember that not every sending method records messages there, so an empty Sent folder does not rule out unauthorised sending.
Next, review cPanel’s available delivery information or ask your hosting provider to inspect the server logs.
Determine whether the messages originated from an authenticated mailbox, a website script or another source.
If unauthorised sending is suspected, secure the relevant credentials and investigate the website or application involved.
Avoid deleting all the notifications before preserving the information needed for troubleshooting. The sender details, timestamps and delivery errors may help the hosting provider identify the cause.
If the notifications continue arriving, ask your provider to investigate the mail flow and determine whether the messages are genuine delivery reports, unwanted backscatter or another type of mail activity.
Should You Increase Your cPanel Email Sending Limit?
Increasing the limit can be reasonable when your business has a legitimate need to send more email than the current plan allows.
For example, an organisation may have expanded its workforce or introduced additional transactional notifications.
However, the limit should be increased only after the sending activity has been understood.
If a compromised mailbox is generating spam, a higher limit could allow more unwanted messages to leave the server. This can lead to additional restrictions and damage the reputation of the sending infrastructure.
If the messages are legitimate but the business is sending bulk newsletters, a dedicated email marketing service may be a better option.
Such services are designed for campaign management, subscriber consent, unsubscribe handling and delivery reporting. Their suitability depends on the type of messages being sent and the service’s policies.
Ordinary business email hosting is generally best used for correspondence, customer communication and appropriate transactional messages rather than unrestricted bulk campaigns.
The objective is to choose the right sending method for the business rather than trying to force every email requirement through a standard hosting mailbox.
How to Prevent Email Sending Limits From Being Exceeded Again
Once the problem has been resolved, establish practices that reduce the likelihood of a repeat incident.
Use strong, unique passwords for business email accounts and secure administrative access.
Review who has access to shared mailboxes and remove unnecessary access when employees or contractors leave.
Keep websites, plugins and applications updated, and investigate any unexpected increase in automated email activity.
For applications that send notifications, configure sensible sending behaviour and avoid uncontrolled retries.
If your business regularly sends newsletters, promotional campaigns or large volumes of transactional email, assess whether a dedicated sending platform is more suitable than standard hosting email.
Finally, make sure employees know how to report suspicious email activity. Early reporting can help you identify an incident before it affects more accounts or customers.
Frequently Asked Questions
What does email sending limit exceeded mean in cPanel?
It means that the applicable outgoing email allowance has been reached. The restriction may apply to a mailbox, domain or hosting account, depending on the provider’s configuration.
How long does a cPanel email sending restriction last?
The duration depends on the specific limit and the hosting provider’s policies. Some restrictions reset after the relevant time window, while others may require the hosting administrator to investigate and restore sending privileges.
Why am I receiving hundreds of mail delivery failure notifications?
Possible causes include excessive legitimate sending, a misconfigured website script, a compromised email account or messages sent by someone impersonating your address. Check the delivery records to identify the source before deciding how to respond.
Can I increase the email sending limit in cPanel?
The available options depend on your hosting permissions and provider’s policies. Some limits can only be changed by the server administrator. Ask your provider to confirm the limit and investigate the sending activity before requesting an increase.
Does a full email inbox cause the sending limit to be exceeded?
Not necessarily. Mailbox storage limits and outgoing email sending limits are separate restrictions. A full mailbox can cause receiving or storage problems, but it does not automatically explain an hourly sending limit error.
Can a WordPress website cause email sending limits to be exceeded?
Yes. A website can generate excessive email through automated notifications, contact forms, faulty scripts or malicious code. Review the website and the available mail logs if the sending activity appears to originate from an application.
Should I use ordinary hosting email for bulk marketing?
For regular newsletters and promotional campaigns, a dedicated email marketing service is generally more appropriate. It offers tools for managing subscribers, unsubscribes and campaign delivery while helping separate marketing activity from everyday business correspondence.
Need Help Fixing Your cPanel Email Sending Limit?
An email sending limit error is a symptom, not a complete diagnosis. The underlying cause may be a legitimate increase in email volume, a configuration problem, an automated website process or unauthorised account activity.
The most effective solution is to identify which account or application is sending the messages, address the cause and then work with your hosting provider to restore normal email operation.
If your business email is hosted with Tremhost and you are experiencing this problem, contact the support team with the exact error message, the affected domain and the approximate time the issue began. Ask the team to review the relevant delivery records and confirm the sending limit that applies to your account.
If you need professional email hosting for your organisation, visit Tremhost Business Email Hosting to explore the available options.
Protect your business email, investigate unusual activity early and choose an email service that matches your business requirements.
