cada vez que envio un mail me sale este mensaje
This is the mail system at host
I'm sorry to have to inform you that your message could
not be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
hotmail-com.olc.protection.outlook.com[126.96.36.199] said: 550 5.7.1
messages from [188.8.131.52] weren't sent. Please contact
service provider since part of their network is on our block
You can also refer your provider to
[BN3NAM04FT053.eop-NAM04.prod.protection.outlook.com] (in reply to MAIL