SMTP Error 449 is a permanent or "5xx" error code issued by a mail server, indicating the rejection of an email message due to temporary unavailability or issues with the recipient's email address. This error suggests retrying the delivery later.

What are the cases covered in SMTP Error 449?

SMTP Error 449 in phpmailer Instances & Examples:

• Case 1: "449 4.2.1 recipient@example.com: Mailbox temporarily unavailable. Please retry later."
• Case 2: "449 5.3.2 recipient@example.com: Mailbox currently locked for maintenance. Try again in an hour."
• Case 3: "449 5.7.3 recipient@example.com: Mailbox syncing in progress. Email delivery delayed."

What’s Causing This SMTP Error 449 In Your Servers? (in pointers)

SMTP 449 error in phpmailer can occur due to:

• Mailbox maintenance: The recipient's email server undergoing maintenance or experiencing temporary downtime, rendering the mailbox temporarily unavailable.
• Mailbox locking: Another process or user accessing the recipient's mailbox, preventing email delivery.
• Account syncing: The recipient's email client or server syncing or updating, temporarily locking the mailbox.

How to Resolve SMTP Error 449 - Step-by-Step Solution

To resolve this email smtp error 449 in Jenkins servers, follow these steps:

• Wait and retry: Wait for a while and retry the email delivery later as SMTP error 449 often indicates a temporary issue on the recipient's end.
• Verify recipient's email address: Ensure the recipient's email address is spelled correctly and complete, considering that the error implies temporary inaccessibility.
• Contact the recipient: If the issue persists or occurs consistently, reach out to the recipient via an alternative method (e.g., phone) to inform them. They can check the status of their email account or contact their email provider for assistance.