Message could not be sent: The following From address failed: root@localhost : MAIL FROM command failed,... Real domain name required for sender address ,553,5.5.4SMTP server error: MAIL FROM command failed Detail: ... Real domain name required for sender address SMTP code: 553 Additional SMTP info: 5.5.4SMTP server error: MAIL FROM command failed Detail: ... Real domain name required for sender address SMTP code: 553 Additional SMTP info: 5.5.4