Mail issue -

Hi guys - new on here so be gentle

I tried sending an email earlier in the week with a large file attached which failed - I deleted and carried on - or so I thought -

I use Mail - with a Yahoo account ( imap) and Gmail - - all have worked fine and sync to phone and ipad no issues -

I logged in today to find that the mail seems to be showing the mail I tried to send as a recovered file - It keeps wanting to send and then recovers the file -

This is unique to the MacPro machine as Mail on phone Mac Air & Ipad and all okay and in Sync.

Other than deleting the mail account from here is there anyway to find mail pending in an outbox etc

I have done a search but nothing that is specific to this

I have also tried deleting all the recovered ones - they just keep on coming again