How can I see the contents of the mail whose ID I get from mailq command?
Solution 1:
The best way is to make use of the postcat command.
postcat -q A705238B4C
At least the system I can look at right now, /var/spool/postfix is the master directory. Subdirectories of that which matter include active, deferred, bounce, etc. Queued files may be stored using the full file name (A705238B4C) or with some level of hashing depth (A/7/05238B4C).