I configure SM 15.5 as a backup MX server by using KB article (a3133). My primary mail server is exchange 2013 (hosted) and spam filter is barracuda spam filter. I set the domain MX record like weight 10 points to barracuda spam firewall and weight 20 to SmarterMail (SM). If anything happen to barracuda (BC) than SmarterMail (SM) collect all emails in Spool and forward to BC when issue is resolve. This is my simple scenario.
Spool in SM is increasing and right now its 587. Why emails stuck in Spool. All those emails are spam emails.
Please review the below link for screen shots. I tried everything like disable 'Auto-Responders' and
Content Filter Bouncing - 'Require message passed SPF'. Medium/High Probability of Spam will be deleted. I set the spam setting as 'recommended-spam-settings' article but still receiving spams.
Someone please help me to resolve this issue. BC receive lots of spam emails from SM
I am sorry, i am not able to enter links as my account don't have permission.