Hi All,

I am using mail function to send emails by contao (v3.5.12)
I have set both Mandatory field E-mail address of the system administrator and E-mail address of the website administrator.
The problem is now whatever email address that I use as Recipient address for my form generators got reject by following message:
E-mail address rejected: example@email.com
What is going wrong?
Can someone help me please?
Thanks in advance