phpmailer script authenticates mail but exim does not permit delivery

Hi, I have a mailing script on my client's server who is trying to use an account in webmail to send mail. The authentication process works as indicated by the output of the script and the server gets the email into its queue but when I check the delivery report, the mail was not delivered to the sender. Debug from phpmailer script

2016-06-16 03:59:22    Connection: opening to localhost:25, t=300, opt=array (
                                         )
2016-06-16 03:59:22    Connection: opened
2016-06-16 03:59:22    SERVER -> CLIENT: 220-mail.XXX.tk ESMTP Exim 4.87 #1 Thu, 16 Jun 2016 06:59:22 +0300
                                         220-We do not authorize the use of this system to transport unsolicited,
                                         220 and/or bulk e-mail.
2016-06-16 03:59:22    CLIENT -> SERVER: EHLO example.com
2016-06-16 03:59:22    SERVER -> CLIENT: 250-mail.XXX.tk Hello XXX.com [::1]
                                         250-SIZE 52428800
                                         250-8BITMIME
                                         250-PIPELINING
                                         250-AUTH PLAIN LOGIN
                                         250-STARTTLS
                                         250 HELP
2016-06-16 03:59:22    CLIENT -> SERVER: AUTH LOGIN
2016-06-16 03:59:22    SERVER -> CLIENT: 334 VXNlcm5hbWU6
2016-06-16 03:59:22    CLIENT -> SERVER: d2ViLW5vdGlmaWNhdGlvbnNAdGhlYmVkZWxsZS5jb20=
2016-06-16 03:59:22    SERVER -> CLIENT: 334 UGFzc3dvcmQ6
2016-06-16 03:59:22    CLIENT -> SERVER: V0JlbGxlTm90aWYyMDE1
2016-06-16 03:59:22    SERVER -> CLIENT: 235 Authentication succeeded
2016-06-16 03:59:22    CLIENT -> SERVER: MAIL FROM:
2016-06-16 03:59:22    SERVER -> CLIENT: 250 OK
2016-06-16 03:59:22    CLIENT -> SERVER: RCPT TO:
2016-06-16 03:59:22    SERVER -> CLIENT: 250 Accepted
2016-06-16 03:59:22    CLIENT -> SERVER: DATA
2016-06-16 03:59:22    SERVER -> CLIENT: 354 Enter message, ending with "." on a line by itself
2016-06-16 03:59:22    CLIENT -> SERVER: Date: Thu, 16 Jun 2016 06:59:22 +0300
2016-06-16 03:59:22    CLIENT -> SERVER: To: XXX@XXX.tk
2016-06-16 03:59:22    CLIENT -> SERVER: From: The XXX- Reservations 
2016-06-16 03:59:22    CLIENT -> SERVER: Reply-To: reservations@XXX.com

2016-06-16 03:59:22    CLIENT -> SERVER: Message-ID: 
2016-06-16 03:59:22    CLIENT -> SERVER: X-Priority: 3
2016-06-16 03:59:22    CLIENT -> SERVER: X-Mailer: PHPMailer 5.2.9 (https://github.com/PHPMailer/PHPMailer/)
2016-06-16 03:59:22    CLIENT -> SERVER: MIME-Version: 1.0
2016-06-16 03:59:22    CLIENT -> SERVER: Content-Type: text/html; charset=iso-8859-1
2016-06-16 03:59:22    CLIENT -> SERVER: Content-Transfer-Encoding: 8bit
2016-06-16 03:59:22    SERVER -> CLIENT: 250 OK id=1bDOSg-001IfX-3w
2016-06-16 03:59:22    CLIENT -> SERVER: QUIT
2016-06-16 03:59:22    SERVER -> CLIENT: 221 mail.XXX.tk closing connection
2016-06-16 03:59:22    Connection: closed

Then checking the mail delivery, I get this

ECDHE-RSA-AES256-GCM-SHA384:256 CV=no: SMTP error from remote mail server after RCPT TO:: 550-Please turn on SMTP Authentication in your mail client.\n550-XXX.XXX.tk [XXX.63.13.XXX]:55176 is not permitted

calvarystudio

June 16, 2016 11:01

I found the solution by setting 'Restrict outgoing SMTP to root, exim, and mailman (FKA SMTP Tweak) to OFF'. What would be the implications?

kdean

June 20, 2016 06:10

If you're connecting via SMTP to Exim you shouldn't have to disable that feature. One thing to try. You're sending via port 25, try sending via port 587 which requires authentication and may pass muster with the receiving server.

cPanelMichael

June 27, 2016 22:40

Hello, You can find information on this option at: SMTP Restrictions - Documentation - cPanel Documentation You may want to consider using CSF/LFD to restrict SMTP access per-user instead of globally:

phpmailer script authenticates mail but exim does not permit delivery

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