Even though I realize that this is a staff related problem but I've experienced it as a player as well.
A guy sms me something and when I sms back I get the "you're not on his friend list" messsage.
So I propose that when someone who smsed us, while having his receiving sms to friends only, can be answered back by us by using the /re command for the duration of till we get another sms and the /re command gets occupied for someone else.
Kaka wants this for Staff but I believe all players deserve to have this because lets face it, the people who do that either:
1) Forget about the fact that they had theirs to friends only or
2) Are trying to troll or
3) Aren't too bright.