Use Mail Protocol: MAIL
Mail Parameters: -Fyouremail@domain.com (note the capital F, no space in front of your email address)
SMTP Host: localhost
SMTP Username: youremail@domain.com (just your email address)
SMTP Password: use your password used to get your email with your host
SMTP Port: 25
SMTP Timeout: 5
Select YES for New Order Alert Mail
Select YES for New Account Alert

araştırmalarıma göre çözüm bu olabilir; ayarlardan mailinizin başına -F ekleyip deneyin bakalım