This is the Postfix program at host email-2.eurowings.com.
I'm sorry to have to inform you that your message could not be 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 Postfix program
rossi@eurowings.net: host 10.100.1.38[10.100.1.38] said: 550 5.7.1 Unable to relay for rossi@eurowings.net (in reply to RCPT TO command)
rubio@eurowings.net: host 10.100.1.38[10.100.1.38] said: 550 5.7.1 Unable to relay for rubio@eurowings.net (in reply to RCPT TO command)
ruiz@eurowings.net: host 10.100.1.38[10.100.1.38] said: 550 5.7.1 Unable to relay for ruiz@eurowings.net (in reply to RCPT TO command)
steiner@eurowings.net: host 10.100.1.38[10.100.1.38] said: 550 5.7.1 Unable to relay for steiner@eurowings.net (in reply to RCPT TO command)