Not Receiving Form Submission (Your submission failed because of a server error)

  • Resolved thetechnosage

    (@thetechnosage)


    3 months, 2 weeks ago

    The debugger shows the following error. “Mailer: Other SMTP
    SMTP Error: The following recipients failed: [email protected]: Spoofing domains that you do not own to external recipients not allowed.

    Here is the debug output:

    Debug Output:
    Connection: opening to echo.mxrouting.net:587, timeout=30, options=array()
    Connection: opened
    SERVER -> CLIENT: 220 echo.mxrouting.net ESMTP Exim 4.98 Wed, 04 Dec 2024 17:38:58 +0000
    CLIENT -> SERVER: EHLO kalathrishna.com
    SERVER -> CLIENT: 250-echo.mxrouting.net Hello kalathrishna.com [161.35.232.182]
    250-SIZE 52428800
    250-LIMITS MAILMAX=100 RCPTMAX=150
    250-8BITMIME
    250-PIPELINING
    250-PIPECONNECT
    250-AUTH PLAIN LOGIN
    250-STARTTLS
    250 HELP
    CLIENT -> SERVER: STARTTLS
    SERVER -> CLIENT: 220 TLS go ahead
    CLIENT -> SERVER: EHLO kalathrishna.com
    SERVER -> CLIENT: 250-echo.mxrouting.net Hello kalathrishna.com [161.35.232.182]
    250-SIZE 52428800
    250-LIMITS MAILMAX=100 RCPTMAX=150
    250-8BITMIME
    250-PIPELINING
    250-PIPECONNECT
    250-AUTH PLAIN LOGIN
    250 HELP
    CLIENT -> SERVER: AUTH LOGIN
    SERVER -> CLIENT: 334 VXNlcm5hbWU6
    CLIENT -> SERVER: [credentials hidden]
    SERVER -> CLIENT: 334 UGFzc3dvcmQ6
    CLIENT -> SERVER: [credentials hidden]
    SERVER -> CLIENT: 235 Authentication succeeded
    CLIENT -> SERVER: MAIL FROM:
    SERVER -> CLIENT: 250 OK
    CLIENT -> SERVER: RCPT TO:
    SERVER -> CLIENT: 550 Spoofing domains that you do not own to external recipients not allowed
    SMTP ERROR: RCPT TO command failed: 550 Spoofing domains that you do not own to external recipients not allowed
    CLIENT -> SERVER: QUIT
    SERVER -> CLIENT: 221 echo.mxrouting.net closing connection
    Connection: closed
    SMTP Error: The following recipients failed: [email protected]: Spoofing domains that you do not own to external recipients not allowed

Viewing 4 replies - 1 through 4 (of 4 total)
  • Plugin Support Patrick

    (@paddyam)

    Hi @thetechnosage, the error you’re getting when sending out emails is reported by your SMTP server, indicating that the email is being sent from a domain the server doesn’t recognize as owned by the sender. This is a common security measure to prevent email spoofing and phishing attacks.

    To fix this, please confirm that the sending domain is fully authorized and that you’ve added the required DNS records (SPF, DKIM, and DMARC). What Are DMARC, SPF, and DKIM? [Simple Explainer]

    With the sending domain verified, also ensure that the From Email in use belongs to the authorized domain.

    For a step-by-step guide on how to set this up and troubleshoot, see guide on settings up Other SMTP and Troubleshooting WP Mail SMTP

    Thread Starter thetechnosage

    (@thetechnosage)

    Hi @paddyam Kindly note that this is not a new setup. I have been using the existing email on this domain for 2+ years and the emails have been coming through all okay all these days except from the last 4 days. May I know any new rule is implemented that caused this? All verifications are done for the sending domain and the sending domain is used on other sites as well where it is working fine.

    Edit 1: Changing the plugin to “Posts SMTP” fixed the issue, but I really want to go back to WP Main SMTP, so hoping for a fix from your end

    • This reply was modified 3 months, 2 weeks ago by thetechnosage.
    Plugin Support Patrick

    (@paddyam)

    Hey @thetechnosage, thanks for getting back and for the confirmation. First, I’d like to confirm that it’s possible for the flagging to happen even for instances where the emails have been getting delivered correctly in the past. This happens as recipient SMTP servers are continuously monitoring and evaluating the emails.

    To provide some more context, WP Mail SMTP does not have any conditions that would prevent the emails from being sent out; all the errors and reports are reported by the SMTP server.

    As a quick follow-up, would you please check to confirm if the From Email is the same as the one authorized on the connection?

    Plugin Support Patrick

    (@paddyam)

    Hey @thetechnosage,

    We haven’t heard back from you in about a few days, so I’m going to go ahead and close this thread for now. But if you’d like us to assist further, please feel welcome to continue the conversation (please just see my post above).

    Thanks!

    • This reply was modified 3 months ago by Patrick.
Viewing 4 replies - 1 through 4 (of 4 total)
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