What are everyones thoughts on how serious a block from .five-ten-sg.com is? Its seems like many smaller ISP's have ranges listed here when I get blocks but I cant really tell from my own use how this block affects my delivery. Some blacklist checkers like mxtoolbox dont even include it in a check. Does anyone know if any major domains use this checker? I dont imagine they do but..... thoughts? :stickyman:
I still see their listings up, but I do not think anyone is using them to filter anything. This is one of the rarest messages in SMTP logs.
