[GH-ISSUE #1880] SMTP Connection Problem #1471

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opened 2026-02-27 11:17:17 +03:00 by kerem · 1 comment

kerem commented

2026-02-27 11:17:17 +03:00

Owner

Originally created by @burakbuylu on GitHub (Apr 23, 2020).
Original GitHub issue: https://github.com/modoboa/modoboa/issues/1880

Impacted versions

Modoboa: 1.14.0
installer used: Yes
Webserver: Nginx

Steps to reproduce

Im using the PHPMailer for SMTP Access

I got this error :

2020-04-23 10:06:26 Auth method selected: LOGIN
2020-04-23 10:06:26 CLIENT -> SERVER: AUTH LOGIN
2020-04-23 10:06:26 SMTP INBOUND: "334 VXNlcm5hbWU6"
2020-04-23 10:06:26 SERVER -> CLIENT: 334 VXNlcm5hbWU6
2020-04-23 10:06:26 CLIENT -> SERVER: aW5mb0ByZWFkbS5vcmc=
2020-04-23 10:06:26 SMTP INBOUND: "334 UGFzc3dvcmQ6"
2020-04-23 10:06:26 SERVER -> CLIENT: 334 UGFzc3dvcmQ6
2020-04-23 10:06:26 CLIENT -> SERVER: QnVydGlORVQyMDIw
2020-04-23 10:06:29 SMTP INBOUND: "535 Incorrect authentication data"
2020-04-23 10:06:29 SERVER -> CLIENT: 535 Incorrect authentication data
2020-04-23 10:06:29 SMTP ERROR: Password command failed: 535 Incorrect authentication data
SMTP Error: Could not authenticate.
2020-04-23 10:06:29 CLIENT -> SERVER: QUIT

My Settings

$mail->SMTPOptions = array(
'ssl' => array(
    'verify_peer' => false,
    'verify_peer_name' => false,
    //'allow_self_signed' => true
)

);

$mail->SMTPDebug = 4;                    
$mail->isSMTP(true);                                          
$mail->Host       = 'mail.mysite.org';
$mail->SMTPAuth   = true;                              
$mail->Username   = 'info@mysite.org';                  
$mail->Password   = 'MyPassword';
$mail->SMTPSecure = 'tls';
$mail->Port       = 587;

Expected behavior

Video/Screenshot link (optional)

Originally created by @burakbuylu on GitHub (Apr 23, 2020). Original GitHub issue: https://github.com/modoboa/modoboa/issues/1880 # Impacted versions * Modoboa: 1.14.0 * installer used: Yes * Webserver: Nginx # Steps to reproduce Im using the PHPMailer for SMTP Access I got this error : > 2020-04-23 10:06:26 Auth method selected: LOGIN 2020-04-23 10:06:26 CLIENT -> SERVER: AUTH LOGIN 2020-04-23 10:06:26 SMTP INBOUND: "334 VXNlcm5hbWU6" 2020-04-23 10:06:26 SERVER -> CLIENT: 334 VXNlcm5hbWU6 2020-04-23 10:06:26 CLIENT -> SERVER: aW5mb0ByZWFkbS5vcmc= 2020-04-23 10:06:26 SMTP INBOUND: "334 UGFzc3dvcmQ6" 2020-04-23 10:06:26 SERVER -> CLIENT: 334 UGFzc3dvcmQ6 2020-04-23 10:06:26 CLIENT -> SERVER: QnVydGlORVQyMDIw 2020-04-23 10:06:29 SMTP INBOUND: "535 Incorrect authentication data" 2020-04-23 10:06:29 SERVER -> CLIENT: 535 Incorrect authentication data 2020-04-23 10:06:29 SMTP ERROR: Password command failed: 535 Incorrect authentication data SMTP Error: Could not authenticate. 2020-04-23 10:06:29 CLIENT -> SERVER: QUIT # My Settings $mail->SMTPOptions = array( 'ssl' => array( 'verify_peer' => false, 'verify_peer_name' => false, //'allow_self_signed' => true ) ); $mail->SMTPDebug = 4; $mail->isSMTP(true); $mail->Host = 'mail.mysite.org'; $mail->SMTPAuth = true; $mail->Username = 'info@mysite.org'; $mail->Password = 'MyPassword'; $mail->SMTPSecure = 'tls'; $mail->Port = 587; # Expected behavior # Video/Screenshot link (optional)

kerem closed this issue

2026-02-27 11:17:17 +03:00

kerem commented

2026-02-27 11:17:18 +03:00

Author

Owner

@tonioo commented on GitHub (Apr 24, 2020):

@burakbuylu Make sure to use STARTTLS to connect on port 587. And also, check server logs to see if there is any error.

@tonioo commented on GitHub (Apr 24, 2020): @burakbuylu Make sure to use STARTTLS to connect on port 587. And also, check server logs to see if there is any error.