Error 550 (2024)

FAQs

Error 550? ›

What Does SMTP Error 550 Mean? In simplest terms, the 550 error message means the receiver's mail server blocked your message and sent it back to you. Unlike the SMTP 554 error caused by the recipient or sender's server, the 550 email error is often caused by the recipient's server.

The 550 “administrative prohibition” or “relay access denied” bounce error is generated when a recipient mail server detects that our service hasn't been given consent to send email on behalf of the sending domain, which is deemed suspicious and subsequently blocked.

If you encounter a "550 unable to verify sender address" or "550 Sender verify failed" error when trying to send an email, it indicates that the MX (incoming) mail server is either not responding, or is non-existent. Note: these errors do not refer to sender verification (Sending > Verified Senders).

The specific error message “550: High probability of spam” occurs when you attempt to send an outgoing email to another mail server and it rejects it outright due to classifying your message as spam.

550 Error Recipient Quarantined – The email was considered spam, or the email address used is blacklisted.

Your email contains a virus. Your server's IP address is on a blocklist. You have a bad IP reputation or sender reputation. You have a high bounce rate.

As the name suggests, the Access Denied error on a webpage indicates that the web server has denied your request to access the web page, either because you do not have the proper credentials, or because the web server has some technical issues.

Cause An "Access Denied" error message can occur for one or more of the following reasons: The folder ownership has changed. You do not have the appropriate permissions. The file is encrypted.

Why is my email 550 content denied? ›

When you receive an Error 550 Message Rejected (or blocked) when trying to send an email, this means that a spam filter has blocked the message.

The error message you're receiving indicates that the email you're trying to send has been flagged as spam, phishing, or malware. This can happen if the email contains certain keywords or if it's being sent to a large number of recipients at once.

To check if an IP address or domain name is blacklisted, it's best to use an email blacklist checker capable of analyzing many different email blacklists in real time, such as EmailListVerify. Simply enter the IP address or domain name you want to check and wait for EmailListVerify to display the results.

Limit your daily volume of emails to avoid the spam folder. To fix the error 550 high probability of spam returned by email servers, you need to check your volume. For a cold email activity or simply normal activity. If you're sending prospecting / cold emails, your maximum per address per day should be around 150.

Recipient Issues

Potential causes of the 550 permanent failure blocked error include the recipient's email server blocking the sender's IP address, the recipient's mailbox being full, and the recipient's email address being invalid.

Non-existent recipient domain

At times, the domain to which the mail was sent may not exist. This can result from a typo in the email account name. You can also see this error when the recipient domain is in disabled, deactivated or expired status.