Unknown sender mail from plesk SMTP

[PyoneK]

Hello,

I've been using php script to send mails to many recipients via plesk SMTP over a year and it was OK.
My server was down and after the system restore, mails from my domain are received as unknown sender and attachments failed.

I test the script in other servers and found it is working.
I don't know what's wrong.

I'm using plesk 9.5.3.

Thanks in advanced.