Several years ago, my employer's e-mail spam filter blocked the Unicode
mailing list as a "suspect site." Earlier this year, GoDaddy (registrar
of my domain name) did the same, and it took months to figure out what
was going on.
What connection does any of this have to do with DNSBLs? There are lots
of less than fabulous ways to manage a mail system poorly, most of which
have nothing to do with looking up IP addresses in a DNS list.
R's,
John
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