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How to fix SMTP Error 553 5.1.2
SMTP Error 553 5.1.2 is a permanent delivery error that happens when there are issues with a recipient’s domain. In this guide, we will try to cover possible solutions to prevent such issues.
SMTP Error 553 5.1.2 is a permanent delivery failure stemming from the rejection of an email due to issues with the recipient’s domain. To resolve this issue, senders can implement the following solutions:
- Verify the recipient’s email address
- Confirm domain existence
- Check MX records
- Contact the recipient through alternative channels.
- Review your email client settings
- Clean your email list
Receiving the error code 553 5.1.2 with the message “We weren’t able to find the recipient domain” can be alarming and confusing. Though the message is straightforward, it can be challenging to resolve this on a large-scale basis.
High-volume senders must ensure overall health of email infrastructure and contact lists to avoid permanent delivery errors like 553 5.1.2 which can dampen sender reputation. Sales Development Representatives (SDRs) for example, regularly send email campaigns. For them, experiencing 553 5.1.2 is not just a simple technical glitch. It’s a lost lead, missed opportunity, and a “burnt” domain.
SMTP Error 553 5.1.2 – What is it and why does it occur?
As per Gmail’s own directory of SMTP errors and codes, SMTP Error 533 5.1.2 means “We weren’t able to find the recipient domain. Please check for any spelling errors and make sure you didn’t enter any spaces, periods, or other punctuation after the recipient’s email address.”
For other providers, the 553 5.1.2 error comes with these variations:
- “553 5.1.2 We weren’t able to find the recipient domain.”
- “553 5.1.2 The recipient address is not a valid RFC-5321 address.”
- “553 5.1.2 Recipient domain unavailable”
This particular error stems from the overarching SMTP Error 553, which is a permanent rejection code from a receiving server. Specifically, 553 5.1.2 means there is an issue with the recipient’s email address or domain configurations. In short, the mail server cannot verify or cannot find the recipient’s domain.
Possible reasons why 553 5.1.2 error was triggered includes:
- DNS configuration issues
- Typos in the domain name
- Invalid characters
- Temporary domain issues
How to fix SMTP Error 553 5.1.2
If you’re still asking the question “How do I fix error 553 5.1.2?” you’re in the right place. The following solutions are proven methods to troubleshoot and resolve this error.
Solution 1: Verify the recipient address for typo errors
Double-check that you have the correct email address and that it is correctly typed in the “To” field. Pay special attention to the domain and look for:
- Common typos (Example: .cmo instead of .com)
- Missing or extra characters
- Spacing errors
Solution 2: Confirm if the domain really exists
Use online tools or DNS lookup services to verify if the recipient’s domain exists and is active. You can use command-line tools like nslookup or dig to check if the domain has valid DNS records.
Solution 3: Check MX records
If you have access to the domain management, verify that the MX records are properly configured. MX records direct email traffic to the correct mail servers. Missing or incorrect MX records will prevent email delivery.
Solution 4: Contact the recipient through alternative channels
If possible, reach out to the recipient via phone, text, or social media to confirm their correct email address. They may have recently changed domains or might be unaware of issues with their email configuration.
Solution 5: Review your own email client settings
Ensure your email client isn’t adding unwanted characters or formatting email addresses. Sometimes autocorrect features can inadvertently modify addresses.
Solution 6: Clean your email list
If you’re sending to multiple recipients, use email validation services to validate addresses before sending. This helps identify and remove invalid domains from your list.
Similar to SMTP Error 510, manual entries of email addresses can sometimes result in these errors. When sending to only one or a few email addresses, it may only take a few seconds to check for errors. However, it can be very difficult for high-volume senders to run through each and every email address in your list.
That’s why it’s recommended to import the whole list from forms to Warmy’s Validation Tool which checks for any invalid email addresses.
Warmy users get free 10,000 credits which you can use right away before you launch your next large-scale campaign. Get started today.
Experiencing 553 5.1.2 Error Code once may not do any significant damage to your email deliverability or sender reputation. However, triggering this error repeatedly can cause long-term damage.
The consequences of bulk email permanent failure 553 5.1.2 extend beyond individual failed deliveries.
Since SMTP Error 553 5.1.2 is a permanent error, it will not be resolved by simply retrying. To prevent it from happening again, senders can verify the recipient’s email address, confirm domain existence, check MX records, contact the recipient through other channels, review your email client settings, and maintain proper list hygiene.