Hi. When i do test to check if my creatives inbox or spam, I find that the some message always missing or delayed, in that case i don't know if it spam or inbox.

For example, I send messages to 4 my own accounts, 3 inbox but the other 1 missed, so i don't know it spams or inbox.

Should I send message separately to the missed account again to check spam or inbox? Will the results be same with sending to 4 accounts together?

Now i am keeping send to 4 accounts together to check to spam or inbox, i try again and again, but there are always missing, it makes annoyed.

Thanks for helping.