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

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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.

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