I'm not sure what evidence you have for this, but I'll provide my own: I run over 30 mail servers on normal ISP links. I can categorically state that's not a problem.
FWIW, I agree was a problem years ago. I suspect it isn't now because ISP's can not longer say what an IP Address is used for, or maybe it's because the DU in that RBL's name stands for Dial Up and this is 2020, not 1999. There is one caveat: you do have to get the DNS PTR records set up.
FWIW, I agree was a problem years ago. I suspect it isn't now because ISP's can not longer say what an IP Address is used for, or maybe it's because the DU in that RBL's name stands for Dial Up and this is 2020, not 1999. There is one caveat: you do have to get the DNS PTR records set up.