lukas4444

Registered
Oct 6, 2016
1
0
1
Europe
cPanel Access Level
Root Administrator
Hello,

since today morning, i always receive this message when sending something via PHPmailer:
SMTP Error: Could not authenticate.

It seems there was an update, and now it is no longer working. I am using a seperate server to connect to and sending all emails:
$data['smtp']['host'] = '51.255.XX.XX';
$data['smtp']['port'] = '25';
$data['smtp']['username'] = '[email protected]';
$data['smtp']['password'] = 'password';

However there is a time out everytime. Last time, some months ago, there has been also an update. I had to whitelist (Exim Configuratin) the other servers IP address (from which im sending) to get this to work again.

I also checked the server (which sends emails) log file. And there is a connection:
SMTP connection from [185.66.XX.XX]:36721 (TCP/IP connection count = 1)
but still it is not connecting and either sending any emails.

Also tried to disable cphulk and another server (for sending the outgoing email). I have not changed anything and this was working find for a long time. So this is 100% anything security / cpanel update related issue. Maybe someone can help me out..
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,904
2,237
463
Hello,

Could you verify if "WHM Home » Security Center » SMTP Restrictions" is enabled on this system? Also, are you using any firewall applications such as CSF? If so, check to see if the "SMTP_BLOCK" option is enabled.

Thank you.