After specify tcp::collect, the SMTP services is not working

How can i know memory using in for each iRule?

i am not aware of it but you may check with support engineer or see if somebody here knows.

by the way, what are you trying to do? does the irule work indeed?

in the RULE_SMTP_NORMAL.tcl, you do string toupper but helo and ehlo (in if-condition) are in lower case.

also, in SERVER_DATA, there are 3 same if-conditions ($SERVDATA starts_with "250").