SMTP Error 512 occurs when the recipient's email domain is not resolvable via a valid DNS record.

What are the cases covered in SMTP Error 512?

SMTP Error 512 in phpmailer Instances & Examples:

• Case 1: "512 5.1.2 recipient@example.com: Recipient's email domain is not resolvable via DNS."

What’s Causing This SMTP Error 512 In Your Servers? (in pointers)

SMTP 512 error in phpmailer can occur due to:

• Non-resolvable recipient's email domain: The recipient's email domain lacks a valid DNS record, making it unresolvable.

How to Resolve SMTP Error 512 - Step-by-Step Solution

To resolve this email smtp error 512 in Jenkins servers, follow these steps:

• Ensure correct spelling of recipient's email domain: It is crucial to ensure that the recipient's email domain is spelled correctly.
• Check for valid DNS record: Verify that the recipient's email domain has a valid DNS record. Use DNS Lookup to check if the necessary MX records are available for the recipient's mail server to operate.
• Verify connectivity to resolving the DNS record: If all criteria mentioned above are correct, verify the connectivity to resolving the DNS record from the sender's mail server.

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