A huge issue I have at the moment on my forum, and have had for quite some time is the vast amount of PM's being sent between members. A brief overview - My forum is based around a mobile game, where people can become friends and gift items to each other to progress throughout the game. Originally started as a "Daily Trading Thread" - but as the forum progressed, members have started to create vast PM groups to trade privately. Now I have no issue with this per se, however my issue is the 100,000+ emails being sent monthly because of the PM'ing. As im on shared, my host permits 500 per hour, which a lot of the time is exceeded and thus I end up with thousands in my spam folder. Always a concern that a new member wont receive their confirmation email if this happens at the same time. Now i've been looking at the XF Private Thread mod - Basically moving away from the PM side - Any views on this? I know I could pay to have an email service, but ideally id like to keep costs low and only spend money on the forum where it benefits the majority.