SMTP Error: Could not connect to SMTP host. (550 Bad HELO)

  • Resolved rero40104

    (@rero40104)


    3 years, 11 months ago

    Hi I’ve been getting this error and have tried everything but can’t get the plugin to work. Can you help, please?

    Here’s the debug log:

    Versions:
WordPress: 5.5.3
WordPress MS: No
PHP: 7.4.9
WP Mail SMTP: 2.5.1

Params:
Mailer: smtp
Constants: No
ErrorInfo: SMTP Error: Could not connect to SMTP host.
Host: mail.example.com
Port: 587
SMTPSecure: tls
SMTPAutoTLS: bool(true)
SMTPAuth: bool(true)
SMTPOptions: {"ssl":{"verify_peer":false,"verify_peer_name":false,"allow_self_signed":true}}

Server:
OpenSSL: OpenSSL 1.0.2k 26 Jan 2017

Debug:
Mailer: Other SMTP
SMTP Error: Could not connect to SMTP host.

SMTP Debug:
2020-12-02 22:05:11 Connection: opening to mail.example.com:587, timeout=300, options=array ( 'ssl' => array ( 'verify_peer' => false, 'verify_peer_name' => false, 'allow_self_signed' => true, ),)

2020-12-02 22:05:12 Connection: opened

2020-12-02 22:05:12 SERVER -> CLIENT: 220 LH034.hostexample.com ESMTP Exim 4.94 Thu, 03 Dec 2020 01:33:11 +0330

2020-12-02 22:05:12 CLIENT -> SERVER: EHLO example.com

2020-12-02 22:05:12 SERVER -> CLIENT: 550 Bad HELO - Host impersonating domain name [example.com]

2020-12-02 22:05:12 SMTP ERROR: EHLO command failed: 550 Bad HELO - Host impersonating domain name [example.com]

2020-12-02 22:05:12 CLIENT -> SERVER: HELO example.com

2020-12-02 22:05:12 SERVER -> CLIENT: 550 Bad HELO - Host impersonating domain name [example.com]

2020-12-02 22:05:12 SMTP ERROR: HELO command failed: 550 Bad HELO - Host impersonating domain name [example.com]

2020-12-02 22:05:12 CLIENT -> SERVER: STARTTLS

2020-12-02 22:05:12 SERVER -> CLIENT: 503 STARTTLS command used when not advertised

2020-12-02 22:05:12 SMTP ERROR: STARTTLS command failed: 503 STARTTLS command used when not advertised

SMTP Error: Could not connect to SMTP host.

2020-12-02 22:05:12 CLIENT -> SERVER: QUIT

2020-12-02 22:05:12 SERVER -> CLIENT: 221 LH034.hostexample.com closing connection

2020-12-02 22:05:12 Connection: closed

SMTP Error: Could not connect to SMTP host.
Viewing 3 replies - 1 through 3 (of 3 total)

  • Hi @rero40104,

    Thanks for the error log. The error is all about your DNS misconfiguration, possibly because the web server and mail server having the same hostname (not SMTP Host). It looks like this generally happens on website migration and causes this because of duplicate records on both sites.

    Please contact your server support with the above SMTP debug to look into this. Also, you should not disable SSL verification and use a self-signed certificate – instead fix your mail server.

    I hope this helps!

    Hi @rero40104 – We haven’t heard from you in about a week, so I’m going to go ahead and mark this ticket resolved. If you still have questions, though, please feel welcome to continue the conversation.

    Hello,

    First of all, thank you for this plug-in.

    I have exactly the same issue. I think it can be fixed, please see: https://github.com/PHPMailer/PHPMailer/issues/1095

    If I understand it correctly, it can be fixed by setting/overriding the ‘$mail->Hostname’ variable.

Viewing 3 replies - 1 through 3 (of 3 total)
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