ZD marking my emails as spam (451 qq)

[oragroup]

Good evening everyone,

I speak to various people on a daily basis and I have a lot of information that repeats itself on every email.

Just recently, my ZD started giving me this without even sending the message:

451 qq permanently rejected this message as Spam (#5.5.4)

How can I solve this problem forever?

[phoenix]

ZD isn't marking your messages as spam, it doesn't have any anti-spam system in it. You need to find out why the mail server that rejected your message (and gave you that error message) considers it spam, contact the mail administrator of that server.