Re: resqmta-po-08v.sys.comcast.net [126.96.36.199] is on SpamCop's spammer list.
This same thing started two days ago with me. I can't send emails to a group of collegues with the same company name. All emails are bouncing back. I've regularly emailed with this group for years. Two days ago, all their emails started boucing back. No way to communicate as usual.