> On Sat, Aug 24, 2019 at 08:06:20AM +0200, Herbert J. Skuhra wrote: > > The MX of twc.com is probably rejecting mail servers that have no valid PTR > > record.
> > Received: from mail.netbsd.org (unknown [199.233.217.200]) > > Received: from mail.netbsd.org (unknown [IPv6:2001:470:a085:999::25]) > > I had to whitelist both ip addresses. The problem was fixed last night. > There was a temporary issue with the reverse DNS for mail.netbsd.org, > it has been fixed last night (thanks Jeff!) > Martin Thanks for letting me know! I didn't know what went bad and where, even thought of the possibility of a spam blacklist. I see the lists have come back to life. Tom