CSF Blocking SMTP (Outlook & Wordpress) — CyberPanel - WebHosting Control Panel for OpenLiteSpeed

CSF Blocking SMTP (Outlook & Wordpress)


Cyberpanel and emails were working perfectly fine, however as of today it seems CSF is blocking SMTP connection for both Outlook and Wordpress, Rainloop works just fine.

Reason I quote CSF is because as soon as I disable CSF the emails flow through again, can anyone help me to resolve this please.

Many thanks


  • You can add your IPs to csf whiltelist.

    Or try to remove ips from temporary block list

    csf -tf

    More details here -> https://www.hostdime.com/kb/hd/command-line/useful-csf-ssh-command-line-commands-csf-cheat-sheet
  • Thank you for taking the time to reply, I reset and removed all entries from the block list, although I am still unable to connect via SMTP - Wordpress & Outlook.

    [[email protected] ~]# csf -tf
    csf: There are no temporary IP bans
    csf: There are no temporary IP allows

    Also I added the server IP to whitelist along with quic Cloud IPs but still no change ?

    I do have Modesecurity and Spam Assassin activated also but as I mentioned issue goes when CSF is disabled.

    Maybe I need to go to CSF forum ?

    Thank again for your time :)
  • Yes please check with CSF. Probably you have configured something wrong. QUIC Cloud will not alter your mail delivery or outlook set up.
  • Its pretty much a clean install nothing comes to mind that I may have changed.

    I wasn't sure about the QC IPs, only because it changes the website IP.

    Many thanks again.. Have a good evening :)
  • Just disabled CSF rebooted server, re-enabled CSF and emails are working once more!

    Strange but true haha..

    Many thanks again.

    Take care
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