Yes, all IP listed in csf.allow can bypass the SMTP_BLOCK. You can just add on csf.allow the following:
Code: Select all
tcp|out|d=587|d=1.2.3.4
tcp|in|s=587|s=1.2.3.4
(Don't forget to replace 1.2.3.4 with your server's IP address, and eventually replace the 587 port with your accurate port number)