authentication rejected, but nothing shows in tcpdump

[weierophinney]

I am having this issue... the most similar thing seems to be #170 (in that i can't xdebug and would like to see/debug the communication at protocol level to have a clearer idea) but in my case using tcpdump on port 25 does not show anything... yet there is a smtp protocol error and that baffles me...

I am using espocrm so full code is open source. also here

This is my stack trace. Looks like bad credentials but webmail login works ok in cpanel (it's centos 7.6)...

Zend\Mail\Protocol\Exception\RuntimeException: 5.7.0 ...authentication rejected
 in /home/foo/public_html/crm/vendor/zendframework/zend-mail/src/Protocol/AbstractProtocol.php:348
Stack trace:
#0 /home/foo/public_html/crm/vendor/zendframework/zend-mail/src/Protocol/Smtp/Auth/Login.php(78): Zend\Mail\Protocol\AbstractProtocol->_expect(Array)
#1 /home/foo/public_html/crm/vendor/zendframework/zend-mail/src/Protocol/Smtp.php(222): Zend\Mail\Protocol\Smtp\Auth\Login->auth()
#2 /home/foo/public_html/crm/vendor/zendframework/zend-mail/src/Transport/Smtp.php(401): Zend\Mail\Protocol\Smtp->helo('vps.me.com')
#3 /home/foo/public_html/crm/vendor/zendframework/zend-mail/src/Transport/Smtp.php(383): Zend\Mail\Transport\Smtp->connect()
#4 /home/foo/public_html/crm/vendor/zendframework/zend-mail/src/Transport/Smtp.php(394): Zend\Mail\Transport\Smtp->lazyLoadConnection()
#5 /home/foo/public_html/crm/vendor/zendframework/zend-mail/src/Transport/Smtp.php(251): Zend\Mail\Transport\Smtp->connect()
#6 /home/foo/public_html/crm/application/Espo/Core/Mail/Sender.php(397): Zend\Mail\Transport\Smtp->send(Object(Zend\Mail\Message))
#7 /home/foo/public_html/crm/custom/Espo/Custom/Services/Email.php(116): Espo\Core\Mail\Sender->send(Object(Espo\Entities\Email), Array, Object(Zend\Mail\Message))
#8 /home/foo/public_html/crm/application/Espo/Services/Email.php(324): Espo\Custom\Services\Email->send(Object(Espo\Entities\Email))

I can't find a log for any of this nowhere... can someone suggest some paths that could help?

Thansk

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Originally posted by @beppe9000 at zendframework/zend-mail#241

[alexmerlin]

Closing issue due to being inactive for more than 1 year.