Today, I found out that spamhouse starts to block legitimate mails for me. web.de's outgoing mailhost 217.72.192.243 is now blocked in SBL. 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.