Email Delivery Issue

Why can’t I send email to a certain email address?

There can be several reasons why you’re unable to send emails to a specific recipient. Here are the most common issues and how to troubleshoot them:

1. Recipient Email Address Is Incorrect or Doesn’t Exist

Ensure that the email address you’re sending to is correctly typed. A single typo can result in a non-delivery error.

2. Recipient Server Rejecting Emails

The receiving mail server may reject your emails due to:

• IP blacklisting
• Suspicious email content
• Authentication issues (like missing SPF, DKIM, or DMARC records)

You may see bounce-back messages like:
550 5.7.1 Relaying denied
550 5.1.1 User unknown
554 5.7.1 Message rejected due to content

3. Your Mail Server Is Blacklisted

Check your domain or IP reputation using tools like:
MXToolbox or Spamhaus.

4. Missing SPF, DKIM, or DMARC Records

These DNS records validate your domain’s email legitimacy. See our guide:
How to Setup SPF, DKIM, and DMARC.

5. Greylisting or Spam Filtering on Recipient Side

Some recipient servers may temporarily reject or delay your emails as a spam prevention measure.

6. Blocked Ports or Configuration Issues

When using our SMTP services, ensure you’re connecting through the correct ports (e.g., 587 for TLS) and with valid credentials.

Still need help?

Please Contact Support for further assistance.

✅ Summary