If you use Plesk Email Hosting with Rebel, your email service is optimized for business communications, billing, and standard transactional messages.
This guide explains our platform email sending limits, why bulk mailing poses significant risks to your domain's inbox reputation, and how to request a temporary hourly limit adjustment.
Understanding Our Email Sending Limits
To protect shared server IP addresses and ensure optimal delivery for all hosted businesses, Rebel enforces strict outbound email rate limits across both Classic and Plesk hosting servers:
- Default Outbound Limit: 100 emails per hour, per domain.
- Maximum Adjustable Limit: Up to 300 emails per hour, per domain (upon request and technical approval).
- Unlimited Outbound Email: Strictly not permitted under any circumstances.
Why Limits Exist: Allowing unlimited or unmonitored outbound email streams risks server IP blacklisting across major providers like Gmail, Outlook, and Yahoo. Furthermore, excessive volume will trigger automatic outbound blocking by MailChannels or upstream filtering networks, which can halt all email delivery for your domain.
The Risks of Bulk Mailing on Shared Email Hosting
Standard web hosting servers are not designed for mass email marketing or newsletter blasts. Attempting to send high-volume campaigns (e.g., thousands of emails at once) through Plesk email carries major risks:
- MailChannels Spam Filtering & Blocks: MailChannels continuously monitors sending velocity and content patterns. Rapid bursts of similar emails—even legitimate newsletters—are frequently flagged as spam, causing outbound messages to be rejected or deferred.
- Domain & IP Reputation Damage: High bounce rates or recipient spam reports damage your domain's reputation, making future regular business emails land in your recipients' spam folders.
- Delivery Failures: Sending more than 100 emails within a single hour causes remaining messages to queue up or bounce back with sending limit errors.
Best Practices for Sending Larger Batches
If you need to send routine announcements or monthly updates to a moderate subscriber list (e.g., 500 to 1,000 recipients):
- Stagger Your Dispatches: Divide your mailing list into smaller batches (e.g., 50 to 80 messages per hour) and schedule them across multiple hours or days.
- Maintain Clean Lists: Ensure all recipient email addresses are valid and active to minimize bounce rates.
- Use Dedicated Mass-Mailing Platforms: For large newsletters, promotional campaigns, or transactional lists exceeding a few hundred recipients, we strongly recommend using dedicated email marketing services such as Mailchimp, SendGrid, Constant Contact, or MailerLite. These platforms manage deliverability, unsubscribe links, and SPF/DKIM alignment automatically.
How to Request an Hourly Rate Limit Increase (Up to 300/hour)
If your business requires a higher hourly throughput (up to a maximum of 300 emails per hour) for legitimate operational needs:
- Contact our support team by submitting a ticket or starting a chat.
- Provide your domain name and a brief explanation of your email use case (e.g., monthly billing notices or customer updates).
- Our team will generate an escalation ticket for our Hosting Engineering team to adjust the outbound limit on your Plesk server configuration.
- You will receive an email update as soon as the configuration update is complete.
Need Extra Assistance?
You can start a live chat on our website during our business hours or email our support team at service@rebel.com (or service@rebel.ca for Rebel.ca account holders).
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