I am getting some mails from Mailer-Daemon@s09.webhost1.ru recently which contains the following body
email@example.com (Generated from tm@polimer**.com) SMTP error from remote mail server after end of data: host mxs.mail.ru [188.8.131.52]: 550 spam message rejected. Please visit http://help.mail.ru/notspam-support/id?c=492kXe0dKYSNlz4sMg9yCER_-TdG5vEtBgAAAM5DAQAxgVkl or report details to firstname.lastname@example.org. Error code: 5DA4DDE384291DED2C3E978D08720F3237F97F442DF1E646. ID: 00000006000143CE25598131.
In reality I never sent the mail to email@example.com and by the looks of it, the mail was sent from plastok@my_domain.com but I don't have any log in my mail server(checked the outbox) about the email being sent to the above referred address.
I have catch all mail enabled in my mail server. My original mails are being sent through Gmail and can also be sent from my domain sever with webmail.
Is it the spoofing? How to identify the sender? If not possible how to stop those mail from sending using my domain name? Please help me to get out this situation.