Shared hosting email limits control how many mail boxes you can create per domain, how much email you can send, and how much mailbox data you can store. These limits matter for both everyday business correspondence and website notifications, including order confirmations, password resets, and registration emails.
The first thing to check is how your emails leave your website. Messages sent through the hosting server may have different limits from those sent through a business mailbox or an external email service.
What Are Email Limits in Shared Hosting?
Email limits usually cover several separate allowances:
- Sending volume: Messages or recipients allowed per minute, hour, or day.
- Mailbox storage: Space available for messages and attachments.
- Message size: Maximum size of an individual email, including attachments.
- Mailbox count: Number of email accounts included in your plan.
Providers impose these limits to manage server resources, contain abuse, and protect mail server reputation. Limited allowances and free trials also create opportunities to upsell paid email services.
Hostinger, for example, includes email as a one-year trial with eligible hosting plans, then requires a paid subscription to keep those inboxes active (see screenshot). With a valid payment method saved, the mailboxes automatically renew onto a paid plan. This adds an ongoing email cost even if you have already prepaid several years of website hosting. An “unlimited email accounts” offer therefore needs checking for storage limits, sending caps, and how long the inclusion actually lasts.
.59/month on a 12-month term, illustrating how bundled email becomes an additional recurring expense." data-lazy-srcset="https://hostscore.net/wp-content/uploads/hostinger-mailboxes.jpg 1200w, https://hostscore.net/wp-content/uploads/hostinger-mailboxes-768x403.jpg 768w" data-lazy-sizes="(max-width: 1200px) 100vw, 1200px" data-lazy-src="https://hostscore.net/wp-content/uploads/hostinger-mailboxes.jpg"/>
Do Mailboxes and Website Notifications Share the Same Limits?
Mailboxes and website notifications do not always share the same limits. The applicable limit depends on the service handling the message.
| Sending method | Which limits apply? |
|---|---|
| Website uses the hosting server’s built-in mail system | The host’s server-based sending allowance |
| Website connects to a business mailbox through authenticated SMTP | The mailbox provider’s sending limits and usage policies |
| Website sends through an external SMTP service or API | The external provider’s quotas and policies |
SMTP is the protocol used to submit email to a mail server. A WordPress SMTP plugin can change where your website sends messages, but installing one does not automatically increase your allowance. Connecting it to the same restricted mailbox still leaves you subject to that mailbox’s limits.
This distinction matters when troubleshooting. Buying more mailbox storage will not resolve a website’s server-based sending cap.
How Do Providers Count Email Usage?
Check both the counting unit and the scope of the allowance. A quota may apply to one mailbox, one domain, or the whole hosting account.
Some providers count recipients rather than messages. One message addressed to ten people may consume ten units of your allowance. SiteGround, for example, counts each recipient separately toward its hourly sending quota (see screenshot below). You should also check the reset period. A rolling 24-hour allowance tracks usage over the preceding 24 hours; it does not necessarily reset at midnight.
Estimate website volume by counting notifications, not just customers. For illustration, 50 orders generating one customer confirmation and one administrator notification each would create 100 outgoing messages. Password resets and other alerts would add to that total.
What Happens When You Reach an Email Limit?
A sending limit may cause messages to be rejected, deferred, or temporarily blocked. The outcome depends on the provider and sending method. Do not assume every failed message will be queued and retried automatically.
For an online store, this can mean a completed order without a delivered confirmation.
For a membership site, it can leave users waiting for password resets or account verification emails.
Mailbox storage limits create a different problem: a full inbox may reject incoming mail. SiteGround explicitly states that messages rejected because storage is full are not retained for later delivery. Clearing space will not recover those rejected messages. ages to identify the cause. A website displaying “message sent” does not prove that the recipient received it.
What Do Real Hosting Policies Look Like?
These examples show why email limits need to be checked for the specific plan and sending method.
| Provider and service | Published limit | Practical implication |
|---|---|---|
| SiteGround StartUp and GrowBig | 400 outgoing recipients per hour | Multiple recipients consume the allowance faster |
| SiteGround GoGeek | 800 outgoing recipients per hour | A higher tier increases this particular sending allowance |
| SiteGround shared hosting email storage | Up to 10 GB combined across the plan’s email accounts | Mailboxes share an overall email storage ceiling |
| Hostinger hPanel hosting server’s built-in mail system | 10 emails per minute, up to 100 per rolling 24 hours | Website scripts can reach a cap separate from mailbox limits |
Sources: SiteGround email policy and Hostinger hosting limits. Policies can change, and legacy or regional plans may differ. Confirm the allowance in your account or with support before purchasing or upgrading.
What Should You Do When Your Website Exceeds Its Sending Allowance?
Start by finding out why usage increased. A busy sales period may explain it, but repeated notifications, abused contact forms, or a compromised account can also generate unexpected traffic.
Then address the sending workflow:
- Confirm the route and quota. Identify the mail server your website uses and the exact limit being reached.
- Reduce unnecessary messages. Remove duplicate alerts and protect forms against automated abuse.
- Monitor failures. Use delivery logs and quota alerts where available.
- Handle retries carefully. Retry temporary failures through a controlled queue, with safeguards against duplicate sends.
- Move critical notifications when needed. Consider a transactional email service when the existing allowance cannot support normal demand.
Services such as SendGrid, Mailgun, and Amazon SES provide dedicated sending infrastructure. They still impose quotas and require appropriate authentication and sender practices. Using one does not guarantee inbox placement.
Should You Upgrade Hosting or Use an External Email Service?
For established businesses, we strongly recommend keeping business email with a separate provider from your website hosting. Bundled email can be an affordable starting point, but once customers, suppliers, and staff depend on your inboxes, continuity matters more than the convenience of one subscription.
Keep Business Email Available During Website Outages
Imagine your hosting provider experiences an outage. Your website is unavailable, customers are asking questions, and you need to contact support. If your email relies on the same affected infrastructure, you could lose your main communication channel precisely when you need it most.
Separating email from website hosting reduces this shared risk. It also lets you move your website to another host without moving staff mailboxes at the same time. A website outage can then remain a website problem, rather than disrupting your entire business communication.
Consider What a Productivity Suite Adds Beyond Email
Google Workspace and Microsoft 365 cost more than basic mailbox services, but their value extends beyond sending and storing messages. Email becomes part of a connected working environment with documents, calendars, meetings, shared files, and administration tools.
AI adds another reason to consider these platforms. Depending on the subscription, your team can use AI assistance to draft replies, summarize information, and work with business content. Google also supports Gemini connections to third-party tools through Model Context Protocol (MCP), including services such as HubSpot, Asana, and Salesforce. These integrations bring information from other business systems into the workspace.
MCP gives AI tools a standard way to connect to external systems. Alongside APIs and automation platforms, it creates opportunities to build workflows around your inbox, documents, and business applications. Microsoft similarly supports MCP-based connections through eligible Microsoft 365 Copilot configurations.
For a business that will use these capabilities, the higher subscription cost may be justified by the wider operational value. Compare the tools your team can actually use, rather than judging the subscription solely by mailbox size.
Match Each Email Need to the Right Service
Separating staff email does not automatically solve website notification limits. Order confirmations, password resets, and newsletters have different requirements from everyday correspondence.
| Your main need | What to consider |
|---|---|
| Staff correspondence and shared calendars | Standalone business email or a productivity suite |
| AI assistance and connected business workflows | Google Workspace or Microsoft 365, with suitable licensing |
| Order confirmations, password resets, and application alerts | A transactional email service |
| Newsletters and promotional campaigns | An email marketing platform |
| More website processing power or storage | A web hosting upgrade |
A practical setup might use one provider for your website, another for staff inboxes, and a transactional service for automated notifications. This gives each service a clear role and lets you increase capacity where it is needed.
Upgrade Web Hosting When Website Resources Are the Constraint
Before upgrading your hosting plan to resolve an email problem, confirm that the upgrade changes the relevant sending allowance. More CPU, RAM, or website storage does not necessarily mean a higher email quota.
Likewise, a VPS offers more infrastructure control, but operating your own mail server adds security, maintenance, and sender reputation work. For most established businesses, a managed email service is the more practical choice.
For staff inboxes and productivity suites, explore our best email hosting providers. If your website also needs more resources, compare our best shared hosting options. Choose each service around the business function it needs to support.
