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Check for entry under Spamhaus and check emails for spam by checking on the website whether the IP address of the e-mail server is entered as a spam server.
On my emailserver under MailEnable it happened yesterday that a so-called Relay was open for an hour, so other hackers and spammers simply used my e-mailserver as SpamServer in minutes.
As soon as the problem is solved, you can request Spamhaus to be removed from the spam list.
Spam house
Blocklist Removal Center

Spamhaus distinguishes itself in 3 types of spam threat as lists
SBL = public list
XBL = infected PCs
PBL = Database with IP address ranges
SBL The Spamhaus Blocklist
The Spamhaus Blocklist ("SBL") The Spamhaus Blocklist ("SBL")
XBL Exploits BlockList
The Spamhaus Exploits Blocklist (XBL) is a realtime database of IP addresses of hijacked PCs infected by illegal 3rd party exploits, including open proxies (HTTP, socks, analog, wingate, etc), worms / viruses with built-in spam engines, And other types of trojan-horse exploits.
PBL The Policy Blocklist The PBL is a DNSBL database of end-user IP address ranges which should not be delivering unauthenticated SMTP email to any internet mail server. The PBL helps networks enforce their Acceptable Use Policy for dynamic and non-MTA customer IP ranges.

Testing according to IP
If you can be directly with and with Baracuda, the entry from Spamhaus disappears

Checking for domain
In addition, you can check whether a domain is listed as spam domain under query Domain.
The entry is made in the DBL list

Background: and check against Spamhaus after e-mails suspected under spam.
Dear Ladies and Gentlemen, Thank you for your inquiry.?
The acceptance of e-mails was rejected by us because the IP address of the sending server at the time of the e-mail delivery attempt was led on a blacklist of
We adhere strictly to the recommendations of Spamhaus and reject connections from such listed IPs. Exceptions are not possible.
If blacklisting still exists and which steps are required for you to take part, please check the following link:?
[Lnk: "" /]

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