I used to always send the seller a message to say my item/s had arrived, how happy I was with it/them, that their packing efforts had not gone unnoticed and that I had left positive feedback with a 5 star rating. Then I saw someone mention on here that sending a message to sellers post transaction could trigger a defect, so I stopped. 99% of sellers would reply back thanking me profusely. I still message overseas sellers. One seller that I used to buy off regularly from England, he would hold items until I filled a box to save on postage. One item had fallen off my purchase history before I got my package, so I couldn't leave feedback. He said it was no problem and that a message was the best feedback because it was more personal.

Does anyone know for sure if sending an Australian seller a message post completed transaction triggers a defect?