Re: [tor-relays] BitTorrent complaint

On 13.04.2013 09:05, Jorge-Leon wrote:

...

1. Allow everything (except port 25, which is reasonable to block)
2. If you don't want the DMCA spam notices, use the reduced exit policy.

Please expand on "except port 25, which is reasonable to block", or point me to an explanation.

In short: We had port 25 (SMTP) open for a while, which results in a lot of spam directly sent to mailservers across the globe, which then immediately will get your IP blacklisted at a lot of DNSBLs. Many ISPs don't like their own ranges to contain blacklisted IPs, because that results in lower overall "reputation scores", and sometimes blacklistings are extended to a whole range of IPs, which then affects other customers.