Na superuser.cz nenaleznete žádný zbytečný obsah, vždy se jde přímo k věci, denně se zde objevují nové problémy a jejich řešení...
This is the mail system at host mail.server.cz.
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
email@example.com: host mail.email.cz[188.8.131.52] said: 554
5.7.1 Message refused by DNSBL check. sbl-xbl.spamhaus.org / 184.108.40.206 This email has been rejected. The email message was detected as spam. (in reply to end of DATA command)