Ah I see. How often does he do stuff like that (mass email thing)? Is it limited to something like that or is there anything more to it? I can see it can be a nuisance, but I wouldn’t be bothered by it if that’s the extent of it. Though I suspect there is quite a bit more to it than that seeing that it’s gotten you to write a topic about dealing with it.
Otherwise, my way of dealing with it is to take the good and leave the bad that anyone gives you. I’ve seen the other side of the coin, where people who don’t even pray, fast, pay zakaat and make excuses to not go for hajj will lecture others on Islam says this and Islam says that.