Greylisting[0] would still be a problem. Signup is exactly the situation where this would be both most likely and most inconvenient. [0] https://en.wikipedia.o

Greylisting[0] would still be a problem. Signup is exactly the situation where this would be both most likely and most inconvenient. [0] https://en.wikipedia.org/wiki/Greylisting https://en.wikipedia.org/wiki/Greylisting