Tình trạng lỗi thường gặp,
While sending an email from Roundcube webmail I was receiving following error[error]SMTP Error (435): Authentication failed [/error]
1/ To fix this issue edit file /usr/local/cpanel/base/3rdparty/roundcube/config/main.inc.php
and make following changes. i.e remove %u
$rcmail_config[‘smtp_user’] = ‘%u’;
$rcmail_config[‘smtp_user’] = ‘ ‘;
2/ Try resetting your password, that sometimes helps.
If you have any ways better please comment below