What Does a Blocked Domain Mean?
A blocked domain cannot be used to send campaigns or emails in SendX until the issue is reviewed and resolved.
Everything else in your account continues to work normally. You can still:
Log in and access your account
Create and edit campaigns
Manage your contacts and lists
Send emails using any other domain that is not blocked
Only the specific blocked domain is affected. Other domains in your account are not impacted.
Where Will I See This?
The blocked status appears under Account Settings > Domains in your SendX account. You can check the status of all your sending domains there at any time.
Why Was My Domain Blocked?
SendX monitors all sending activity to protect deliverability for every customer on the platform. A domain may be blocked when signals indicate that sending from it could harm your sender reputation or violate platform guidelines.
The most common reasons a domain gets blocked are listed below.
High bounce rate
If too many emails sent from your domain are bouncing, it is a strong signal that the contact list contains invalid, outdated, or unverified addresses. High bounce rates hurt your sender reputation and affect deliverability across the platform. Industry norms set clear thresholds for acceptable bounce rates, and consistently exceeding them will trigger a block.
Spam complaints
When recipients mark your emails as spam, mailbox providers report this back to senders. A high complaint rate indicates that recipients did not expect your emails, do not recognize your brand, or never consented to receive them. This puts your domain at risk of being flagged or blacklisted.
Authentication failure
Your domain must have valid SPF, DKIM, and DMARC records configured to send emails reliably. If these DNS authentication records are missing, misconfigured, or fail verification, your domain may be blocked to prevent deliverability issues and protect against spoofing.
Email warmup violations
New domains and IP addresses need to be warmed up gradually before sending at high volumes. Skipping warmup or sending large volumes too early can trigger spam filters and damage your sender reputation before it is established.
Sudden or suspicious volume spikes
A sharp, unexplained increase in sending volume from a domain raises risk signals. This can be caused by accidental campaign triggers, list imports without proper validation, or unauthorized access.
Terms of Service violation
SendX prohibits sending emails that violate its Terms and Conditions. This includes sending to purchased or rented lists, sending prohibited content, or any activity that constitutes phishing, fraud, harassment, or abuse. Violations may be detected automatically by the system or reviewed and actioned manually by the SendX compliance team.
Note: In most cases, blocks are temporary and can be lifted once the underlying issue is resolved. In rare cases involving severe violations such as phishing or fraud, a domain may be permanently blocked.
How to Get Your Domain Unblocked
Follow these steps to resolve the issue and submit a request to unblock your domain.
Step 1: Identify and fix the root cause
Based on the possible reasons above, review your recent sending activity and take corrective action:
Remove invalid, bounced, or unengaged contacts from your list
Check that your SPF, DKIM, and DMARC records are correctly configured
Review how your contacts were acquired and confirm they opted in
Check your recent campaigns for content that may have triggered spam complaints
Review your SendX warmup settings if you recently added this domain
If you believe the block was triggered in error, document your reasoning
Step 2: Contact the SendX support team
Once you have addressed the issue, reach out to the team at support@sendx.io with the following information:
The blocked domain name
A brief explanation of what you believe caused the block
The steps you have taken to fix the issue
Any supporting details such as your list acquisition source, authentication setup confirmation, or content review notes
Step 3: Wait for verification
The support team will review your request and verify that the issue has been resolved. Once confirmed, your domain will be unblocked and you can resume sending.
Important Notes
Do not attempt to work around a blocked domain by creating a new domain to send the same content. This may result in additional restrictions on your account.
Fixing the root cause before submitting a request will significantly speed up the review process.
If multiple issues are found, all of them need to be addressed before the domain can be unblocked.
Frequently Asked Questions
Can I still send emails while my domain is blocked? Yes. You can send emails using any other domain in your account that is not blocked. Only the specific blocked domain is restricted.
Will my campaigns and automations be lost? No. All your campaigns, automations, contacts, and data remain fully intact. You just cannot send using the blocked domain until it is unblocked.
How long does the unblock process take? Most reviews are completed within one business day after you submit your request with the required details. Response times may vary based on the complexity of the review.
Can the block affect my entire account or other domains? No. A domain block is isolated to that specific domain. Your account and all other domains continue to function normally.
What if my domain is permanently blocked? Permanent blocks are reserved for severe violations such as phishing or fraud. If you believe a permanent block was applied in error, contact support@sendx.io to discuss your case.
I fixed the issue but the domain is still showing as Blocked. What should I do? The status will not update automatically. You need to contact support@sendx.io after completing the remediation steps. The team will verify and manually lift the block.
Still need help? Reach out to the SendX support team at support@sendx.io.