Posta gönderimi başarısız oldu.Can't send command to SMTP host

Posta gönderimi başarısız oldu.Can't send command to SMTP host

Our support system email communication is not working properly, but actually our mail system is working properly.

When sending mail over support system , i have been getting such that message :  Posta gönderimi başarısız oldu.Can't send command to SMTP host.

In our mail configuration, smpt auth is 587 without TLS, but in the support system mail configuration, there is only a choice "587 with TLS". İs this a problem to communicate?









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