KevinTheJedi
Kevin Hi, thanks for your assistance,
in osTicket logs writes like:
Mailer Error
Unable to email via SMTP: noreply@crm.kerberos.com.tr (ssl://crm.kerberos.com.tr:465/SMTP) No Such User Here
Log Date: Sunday, August 13, 2023 at 8:02 AM IP Address: 188.119.21.172
but mailer is working for gmail vs. I've talked with my hosting company and they did configurations on firewall but still problem goes.