How to Fix Email Sending Limits and Throttling

dotCanada's cPanel-based email hosting enforces hourly sending limits on each domain. These limits exist to prevent spam and protect the server's reputation. If you hit the limit, outgoing emails will be temporarily blocked until the next hour.

Default Sending Limits

cPanel typically allows a set number of emails per hour per domain (e.g., 300–500 emails per hour, depending on your plan). If you exceed this, you'll receive a bounce error or a delay.

Common Signs You've Hit a Sending Limit

• Emails are bouncing with a message like Too many emails sent in a short period
• Your email client reports a sending failure even though credentials are correct
• Emails in your sent queue are not going out

What to Do

1. Wait an hour - limits reset on an hourly basis. Pending messages may go out automatically.
2. Spread out large sends - if you're sending newsletters or bulk messages, space them out over time or use a dedicated email marketing service like Mailchimp.
3. Check for malware or a compromised account - if you haven't been sending bulk email but still hit the limit, your account may have been compromised and is sending spam. Change your password immediately.

Increasing Sending Limits

If your legitimate email volume regularly exceeds the default limits, contact our support team to discuss your options - we can review your account and adjust limits where appropriate.