The basic syntax for lsof is straightforward. Simply type lsof in the terminal, and it will list all open files. However, for email marketing purposes, you might want to narrow down the results. For example, to see open files related to a specific process or network connection, you could use the following commands: lsof -p [PID] This command lists all open files for a specific process ID (PID), which could be your email server process.
lsof -i :25 This command lists all open files related to network connections on port 25, which is commonly used for SMTP (Simple Mail Transfer Protocol).