Today, I found out that spamhouse starts to block legitimate mails for me.
web.de's outgoing mailhost 18.104.22.168 is now blocked
Frankly speaking, it is IMHO not acceptable if a provider with a (at least
mostly) working abuse department ends up in a conservative blocking list.
For me, the consequence of this is that spamhouse is removed from my
blocklist, and will probably never come back again.