It's not really forbidden, it's just in incredibly poor taste and basically cheating. Funnily,
@MJJ (one of his opponents here) did the same thing in his miraculous comeback win against me in one of the auction drafts. At least, that's what 2 people told me who received PMs from him back then. That was the thread back then and it overall had significantly more votes than all the other matches during the draft, just like it's the case here:
https://www.redcafe.net/threads/transfer-muppet-fantasy-qf-balu-vs-mjj.389249/page-4
Back then, I didn't really care and chose to ignore it. Winning doesn't matter all that much to me.
Obviously if one manager sends PMs out, he'll send it to users he knows and the chances of it helping him win are crazy high. Barely anyone of those people makes a fair decision, because they start looking in this thread with a clear preference to
@Raees who sent the PM. It doesn't matter if he'e writes they can choose freely and the result here clearly shows it, as did it back when MJJ did it against me.
I don't mind giving Raees the benefit of the doubt and assume that the crazy drama and intense discussion in this match got the better of him and he made a mistake. I'd suggest that Raees gives us (or only me) a list of all the users he wrote to and we take all of them out of the result, no matter who they voted for, and then see what result we get. It's the only way to turn this back into something close to a fair game. If he doesn't want to, I'll let him go through as a winner. But every manager really should think about, if it's worth to turn the matches into a fecking joke. In the end we all spend a shitload of time for these drafts and we should at least try to let the voting play out fairly.