You can manually delete them via database, this is the only way. 

ok, do you know why this happened? I mean I deleted some messages 2 years ago yet they came back

Can you please provide screenshots or make a video, how do your redelete message? As we cannot reproduce that on our test websites or demo. 

HI, sorry for the delay on this, I had other more pressing matters, I went into phpmyadmin and looked at the table for mailbox.... every message thats been sent on my site it there, over 3000 pages.
It has a delete option, it this where I remove the messages?

Do you want to remove all of them or just the one which reappears? Yes, this is done in this table. 

figured I'd remove the majority up to a certain point, i noted the messages start from when I started my site in june 2012, is this normal?
Is there a setting to automaticly delete things from this table over 6 months old?

No, there's no such setting. 

Well if you had any conversations chat/or mailbox message then it is normal. 

so when you delete them from your inbox theyre not deleted from the database?

Also in the next update can you suggest oxwall put in a "select all" option for delete?

Image capture is self explanatory, Note I don't have many conversations at mine as I clean it up weekly.

I'm just iffy about deleting stuff. In case I break it

I can do for you if you wish, am on Skype if you want ;->

Actually I have to step out for a bit, let me know if you'd like me to do it, and by do it I meant  perform this operation lol.

I forgot about uservoice.... the thing is I have deleted them from my inbox once already.... many in 2012 and 2013...
and will do Krunch.... I will catch you tomorrow n talk about it

Can you please try again? 

1. make a screenshot of a message you're going to delete

2. delete it

3. make a screenshot of this message in DB