mailbox.org reject harmless messages as spam without warning the receiver.
A lot of incoming email are silently rejected.
This must be fixed for mailbox.org to be used.
Senders received a bounce message looking like this:
<firstname.lastname@example.org>: host mxext1.mailbox.org[22.214.171.124] said:
> 554 5.7.1
> Service unavailable; Client host [126.96.36.199] blocked by RBL;
> Blocked -
> see http://www.spamcop.net/bl.shtml?188.8.131.52 (in reply to RCPT
This means that mailbox.org reject a harmless message as spam without warning the receiver.
The reason of this major bug is a psychorigid implementation of SCBL.
From SCBL itself:
The SCBL is aggressive and often errs on the side of blocking mail.
When implementing the SCBL, provide users with the information about
how the SCBL and your mail system filter their email. Ideally, they
should have a choice of filtering options. Many mailservers operate
with blacklists in a "tag only" mode, which is preferable in many
Please correct immediatly.