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Email sending limits
Every Kualo hosting account has an hourly email sending limit - here is what that means and what to do if you need more.
Every Kualo hosting account has a limit on how much email it can send per hour. This guide explains those limits, what happens if you reach them, and what to do if you need to send more.
How many emails you can send per hour
Your hourly outbound limit depends on your plan. The figures below are current at the time of writing; the authoritative, up-to-date limits are always those in our resource usage policy (web and business hosting, reseller hosting).
Web and business hosting - the limit is set by your plan:
| Emails per hour | Max mailbox size | Example plans |
|---|---|---|
| 100 | 2 GB | Nano |
| 200 | 10 GB | Solo, Startup |
| 400 | 15 GB | Performance |
| 600 | 20 GB | Performance Plus, Magento Startup |
| 800 | 25 GB | Performance Pro, Magento Professional |
| 1,000 | Up to plan quota | Performance Max, Magento Business |
Reseller hosting - cPanel accounts start at the standard level, and you can raise the limit by applying a resource boost:
| Level | Emails per hour | Max mailbox size |
|---|---|---|
| Standard | 200 | 10 GB |
| Level 1 boost | 400 | 15 GB |
| Level 2 boost | 600 | 20 GB |
| Level 3 boost | 800 | 25 GB |
| Level 4 boost | 1,000 | No limit (up to disk quota) |
The hourly limit counts individual recipients, not messages. An email sent to 30 people counts as 30 towards your limit, whether you sent it as one message or thirty separate ones.
What happens if you go over the limit
If you reach your hourly limit, further messages are not lost. They are held in a queue and retried automatically. As the rolling hourly count drops back below your limit, the queued mail is sent. In practice, going over the limit slows your sending down rather than stopping it - your mail goes out over the following hours rather than all at once.
The only way mail is actually lost in this situation is if a message stays queued long enough to pass the retry window (a couple of days) without ever getting through. For normal sending this effectively never happens; it only becomes a risk if you are consistently trying to send far more than your plan allows.
If you are regularly hitting the limit, that is the signal to either change how you are sending (see below) or move to a plan or service designed for the volume.
Sending to multiple recipients
For ordinary email to a handful of people, there is nothing special to do. Beyond that, a few guidelines will keep your sending healthy:
- Keep any single email to 50 recipients or fewer. If you need to reach more people, do not add hundreds of addresses to one message - use proper mailing software instead.
- Use mailing software that can throttle its sending. Any bulk or list-sending tool must be able to pace itself to stay within your hourly limit. Software that fires everything out at once with no rate control is not suitable for shared hosting and is not permitted, because it will hit the limit immediately and can affect the server for other users.
- Always include a working unsubscribe link in any mailing-list message, pointing to an automated removal system that is not behind a password.
Mailing lists and bulk email
Our shared and reseller hosting is designed for transactional and personal email - order confirmations, enquiries, day-to-day correspondence - rather than large marketing campaigns. There is a ceiling of 2,000 unique recipients for mailing-list or marketing email.
If you need to send to more than 2,000 subscribers, the right approach is one of the following:
- A dedicated email marketing platform, such as our own, which is built for the job and manages reputation, bounces and unsubscribes for you.
- A third-party SMTP gateway or API.
- A cloud hosting solution or dedicated server.
A couple of practices are not permitted on our hosting, because they damage deliverability for everyone on the server:
- Bought or rented lists. You may only email people who gave you their address directly. Purchased lists almost always contain spam-trap addresses that can get our servers blocklisted.
- Email warm-up services. Tools that send automated or AI-generated messages to simulate activity and build sending reputation tend to trigger spam filters and put everyone's deliverability at risk. If you need to warm up a sending domain, use a third-party provider or a server with its own dedicated IP.
If you need to send more
If your legitimate sending needs have outgrown your hourly limit, your options depend on your account type:
- On web or business hosting, the hourly limit is tied to your plan, so the route to a higher limit is to upgrade to a larger plan.
- On reseller hosting, you can apply a resource boost to raise the limit without changing the underlying plan.
See our guide on resource boosts for how these work. If you are not sure which option suits you, contact our support team and we will advise.
If a large or growing share of your email is marketing rather than transactional, a dedicated email marketing platform is usually the better long-term answer. It will give you better deliverability and take the load off your hosting account entirely.