[anti-abuse-wg] Another incompetent ISP - Signet, B.V. - transip.net / signet.nl

I recently attempted to report spam that was sent to me from [136.144.219.231].
This address is being routed by AS20857 (ORG-SI6-RIPE / Signet B.V.) and the
containing IP block (136.144.128.0/17) is registered to TransIP B.V. (NOTE:
no associated ORG record) which appears to be just a different face of the
same Dutch company (Signet).

My spam report was sent to the abuse reporting address contained in the RIPE
WHOIS record for the revevant ASN (AS20857) i.e. <abuse at signet.nl>.

Of course, I included in the report a complete copy of the spam message
I received so that the people on the other end could have a clear picture
of the nature of this incident and those responsible for it.

Unfortunately, Signet/transIP appears to be yet another in a succession of
ISPs that have failed to grasp the seemingly obvious fact that enabling
spam filtering on your own inbound spam reporting email address is
counterproductive.  Thus, for my trouble I received back:

<support at signet.blue> (expanded from <abuse at signet.nl>): host
    mx.transip.email[86.105.244.9] said: 550 5.7.1 Our system has detected that
    this message is likely unsolicited mail (SPAM). To reduce the amount of
    spam, this message has been blocked. (4Kpghy5Bcvz1J9nY) (in reply to end of
    DATA command)

Based on this rejection it is now my intention to locally blacklist all IPv4
blocks assigned to this ISP.  A partial list of these is included below.

Unfortunately, due to ongoing and longstanding issues with the RIPE data
base (which I will be mentioning yet again on the RIPE db-wg mailing list,
for all the good it will do) it is not easily possible to derive a full
list of all of the IP address blocks assigned to this company, at least
not in a simple automated fashion.

Blocks assigned to ORG-SI6-RIPE (fully aggregated):

31.3.8.0/21
31.3.96.0/21
31.14.96.0/22
31.223.160.0/20
37.17.208.0/20
37.34.48.0/20
37.97.128.0/17
37.230.96.0/21
46.21.224.0/20
46.226.56.0/21
77.72.144.0/21
78.108.128.0/20
79.170.88.0/21
80.69.64.0/19
80.84.224.0/19
80.246.192.0/20
80.255.240.0/20
81.4.64.0/19
81.4.96.0/22
81.4.112.0/21
81.21.136.0/21
81.30.32.0/20
83.96.128.0/17
84.247.8.0/21
85.10.128.0/18
85.158.248.0/21
85.222.224.0/21
86.105.244.0/22
87.253.128.0/19
89.31.96.0/21
89.41.168.0/22
91.142.240.0/20
91.205.32.0/22
91.216.162.0/24
93.119.0.0/20
93.191.128.0/21
94.142.208.0/21
95.170.64.0/19
141.138.136.0/21
141.138.192.0/20
141.255.176.0/21
149.210.128.0/17
171.33.128.0/21
176.74.224.0/19
178.18.80.0/20
185.3.208.0/22
185.10.48.0/22
185.15.248.0/22
185.21.188.0/22
185.65.52.0/22
185.69.232.0/22
185.76.236.0/22
185.84.72.0/22
185.89.152.0/22
185.95.68.0/22
185.96.4.0/22
185.105.204.0/22
185.105.216.0/22
185.108.112.0/22
185.110.172.0/22
185.110.200.0/22
188.240.52.0/22
188.241.148.0/22
193.93.172.0/22
193.138.204.0/22
193.242.119.0/24
194.60.207.0/24
195.8.195.0/24
195.135.195.0/24
213.187.240.0/21
217.21.240.0/20
217.149.128.0/20