Friendpost 

Complete scam. Stupidly bought the stamps with the postcards as the helpful guy in the shop told us he sold stamps too. Posted them into the correct cardboard box and really felt the shop owner would just put them in the bin after we left! They should not be allowed to operate. Sent 4 postcards and not one has arrived. Avoid at all costs and find the official postal system which we would have done if we’d realised.

Scam for tourists. There are multiple problems with this "company".
1. None of 10 postacards delivered to various destinations.
2. To find a mailbox is almost impossible. The only option is to bring it to the shop that sold you the stamps, where the mailbox is. (but it will not be delivered anyway, you can throw it in the correct mailbox or to the sea - it is the same).
3. The price is higher unline other postal services in Italy.
4. The tracking on the stamps doesn't work. (It is written on their website but the tracking QR code on the second part of the stamp doesn't really work.

Yeah, you go to the Italy for the weekend, send the postcards... Who will you complain it wasn't delivered, right? And in case you complain, they will tell you that you used incorrect mailbox (even if you used the correct one :))

Went to a tabacheria in Venice, which is the right place to buy official stamps from the Italian post. Did not pay enough attention and was sold these bogus stamps.
Their postboxes are impossible to find. On their site there is a list of all postboxes, but no map, which makes it impossible to find one near you.
I left Venice with my postcards...

The second and last time I we be fooled. Venice and Rome one month ago. Highly suspicious. I bought stamps and sent postcards from the vendor who had their official mailbox. Stamps are more expensive than the Post Office. The qr codes on the stamps are “fake” and do not track the postcards like they say. I contacted friend post (they took a week to respond to me that the cards did not reach their hub and that I must have sent them from a wrong mailbox! (Sic)
What kind of bogus service is this? A scam on a large scale because millions of tourists use their stamps that will never deliver your postcards. Never ever use them! Only the official Poste Italiane.

None of the 7 postcards we sent from Venice reached Spain. Scam!!! It was also not communicated to us that they required to be posted in specific mailboxes which "thankfully" we found out about before posting...

We bought stamps in Venice and then the shop already closed. Apparently we should have used that specific postbox within this shop. On the website of friendpost there are also other shops shown where you could post your cards; we went now to 6 different ones and all of them said that they do not offer this service. We decided now to buy stamps from the official post, posteitaline, so we can send our cards via the red postboxes. Conclusion; do not buy these stamps! Since you can nowhere post your cards!

we wrote 6 postcards from italy to belgium and NONE of them arrived :(
waste of money and so sorry we could not share our holiday memories with friend and family.

Postcard took 5 months to arrive
Avoid.
Get your stamp from official italian post.

7 of 7 postcards from Venice never reached their destination in Germany. Scam.

In November I was on vacation in Rome. Unfortunately, I was robbed. Didn’t think I’d see any of my belongings again.
Giulio, at FriendPost contacted me and mailed my documents to me in Canada. I am very appreciative of his kind and helpful service.
Giulio, thanks for the nice gift you included!

We bought some postcards and stamps in Venice, but didn't realize they were not from the official postal services. Too bad, because later, we couldn't find any mailbox to post them. Totally absent! After reading all the negative reviews about Friendpost, we realized it's a big tourist scam.

Here is a solution nobody wanted: a privately held postal service that charges 2.5 Euro per postcard. Stamps are ugly, with giant barcodes, and don't even relate to the country you buy them in. Ohh boy the Sydney Opera house for an Italian stamp. Why?

It's really sad that shopkeepers are paid to sell you these rather than real Italian Post stamps. Just another predatory practice taking advantage of tourists.

Two weeks and my letters have not arrived.