SMTP Error 515 occurs when the recipient's email or mailbox address is invalid or does not exist. It is typically caused by incorrectly spelled email addresses, especially when sending bulk emails.

What are the cases covered in SMTP Error 515?

SMTP Error 515 in phpmailer Instances & Examples:

• Case 1: "515 5.1.1 recipient@example.com: Recipient address is invalid."
• Case 2: "515 5.4.5 recipient@example.com: Mailbox does not exist."
• Case 3: "515 5.7.0 recipient@example.com: Invalid email address format detected."

What’s Causing This SMTP Error 515 In Your Servers? (in pointers)

SMTP 515 error in phpmailer can occur due to:

• Invalid recipient address: The email address specified in the "RCPT TO" command or the "To:" field of the email message is incorrect or does not exist.
• Incorrectly spelled email addresses: Typos or misspellings in the recipient's email address can lead to SMTP error 515.
• Bulk email sending issues: When sending bulk emails, it's easy to include invalid email addresses among multiple recipients.

How to Resolve SMTP Error 515 - Step-by-Step Solution

To resolve this email smtp error 515 in Jenkins servers, you need to do the following:

• Ensure that no email addresses contain invalid characters or syntax.
• Validate all email addresses to ensure they are correct and existent.