I create simple host with:
1. macros {$PORT} = 80
2. Item - simple check tcp,{$PORT}
3. Trigger {HOST:tcp,tcp,{$PORT}.last(0)}#1

I create action to send e-mail, where i used macros {{HOSTNAME}:

.last(0)} to get last result of item.

At this case i receive email with result UNKNOWN, but i can see rigth value in last data. (the same result if i use template)

When i don't use macros and item like tcp,80 , i receive email with rigth value.