Hey,

I am usign PHP to deliver emails. Something the database that PHP queries is not available. I don't want to loose the email, but I don't want to reject it either.

I found with php that if my script ends with exit(255). It will bounce the message and if it ends exit(0) postfix will remove it from the queue as if it were delivered.

Anyone know what exit status can use to tell postfix to try again later?

I found that 69 causes postfix to say 'service unavailable' and bounces the message. I don't suppose anyone knows where I can find a full list of postfix reaction to exit codes?

thanks,
David

Alright,

the correct answer is to use exit code 75. If your PHP script (or any other script) returns an exit code of 75, postfix will defer the message.

http://www.postfix.org/FILTER_README.html
10 # Exit codes from <sysexits.h>
11 EX_TEMPFAIL=75
12 EX_UNAVAILABLE=69

Jun 1 10:48:49 hostname postfix/local[32127]: C7F332C1: to=<test@domain.tld>, relay=local, delay=1, status=deferred (temporary failure)

Hope this helps the next person trying to find this information.