[FIXED] CakePHP 3 & Mercury: SMTP server did not accept the password

Issue

I have localhost xampp server with Mercury mail server. With Thunderbird email client I can send and recive mails from localhost.

But when try send with CakePHP 3.1.x i got error message:

SMTP server did not accept the password.

i use same login data:

    'EmailTransport' => [
    'default' => [
        'className' => 'Smtp',
        // The following keys are used in SMTP transports
        'host' => 'localhost.dev',
        'port' => 25,
        'timeout' => 30,
        'username' => 'info',
        'password' => 'info',
        'client' => null,
        'tls' => null,
    ],
],

Mercury log when send and recive with Thunderbird

T 20151202 221930 565f69f1 Connection from 127.0.0.1
T 20151202 221930 565f69f1 EHLO [127.0.0.1]
T 20151202 221930 565f69f1 MAIL FROM:<nikola@localhost.dev> SIZE=385
T 20151202 221930 565f69f1 RCPT TO:<info@localhost.dev>
T 20151202 221930 565f69f1 DATA
T 20151202 221930 565f69f1 DATA - 12 lines, 385 bytes.
T 20151202 221930 565f69f1 QUIT
T 20151202 221930 565f69f1 Connection closed with 127.0.0.1, 0 sec. elapsed.

Mercury log when try to send and recive with CAKEPHP

T 20151202 222318 565f69f2 Connection from 127.0.0.1
T 20151202 222318 565f69f2 EHLO localhost
T 20151202 222318 565f69f2 AUTH LOGIN
T 20151202 222318 565f69f2 QUIT
T 20151202 222318 565f69f2 Connection closed with 127.0.0.1, 0 sec. elapsed.

Solution

If anyone ever had the same problem, the solution is:

 'password' => null,

Answered By - Salines