PPI is just a form of paying postage. You're using the same services. So, First Class PPI mail will have the same level of insurance as First Class stamped mail. It will also have the same level of service and protection.
You can't get a PPI for airmail, recorded or special delivery. You can only get one for domestic first and second class, as well as mailsort, but I doubt thats of interest to you, thats for the really big companies who send out vast quantities of mail.
You can't get a PPI for airmail, recorded or special delivery. You can only get one for domestic first and second class, as well as mailsort, but I doubt thats of interest to you, thats for the really big companies who send out vast quantities of mail.