Delayed mail from using .countries.nerd.dk RBLs -
See article here
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Are you Getting too Much Spam?
Experiencing Delays with Greylisting?
'application/octet-stream' Mime Type Incorrectly Blocking Attachments
Anti-Spoof Tool Causing False Positives on Version 7.13
Bypassing Banned Attachments & Antivirus Tests from a Specific Sender
Calculating SpamTitan License Usage
Emails With "Passed Unchecked" Subject Line
Excluding an IP from SPF Validation – SPF FAIL
How To Add an O365 Customer to SpamTitan
IMAP Authentication Stopped Working in SpamTitan
include:spf.titan.email is -not- related to SpamTitan
O365 IP Throttling (Rate Limit) & SpamTitan
Office Files Blocked as OLE Macro
Sender Address Rejected: Domain Not Found
Server Stuck in Boot Loop or Not Booting
X-Amavis-Alert: BANNED, Message Contains .exe,.exe-ms,0000.dat
SpamHaus RBL Blocking all Email
Are Users Names being Spoofed?
SpamTitan Update and Upgrade Instructions (re: ClamAV Vulnerability)
SASL authentication failing -- try putting parentheses around the query filter