Am 06.05.2013 09:13, schrieb Benoit Panizzon: >> Backscatter OTOH is a nuisance, which should be minimized of course, but >> cannot be completely avoided. Blacklisting because of backscatter would be >> a Bad Idea (TM) which I thankfully never encountered so far, but if >> someone did that it would certainly be their own fault if they blocked >> legitimate mail as a result. In my experience, misguided measures like >> that tend to get lifted very quickly if senders and (intended) recipients >> of blocked mails are informed in no unclear words who's responsible for >> the communication failure. > > Well, there are such blacklists I can tell you as a tech at an ISP. [...] > We had even the case where one single email was sent over our infrastructure > to a 'special' spamcop.net spamtrap causing immediate blacklisting of our > main > outbound server. And spamcop.net is widely used.
There are all kinds of misguided blacklists. So far, the following procedure has served me well for these cases: 1. Try to contact the blacklist's operators and get the listing removed. If that fails: 2. Try to contact the administrator of the mailserver using the blacklist and ask him or her to stop using that blacklist on grounds that it lists servers (such as mine) without justification and refuses to remove such listings. If that fails: 3. Explain to the sender and recipient of the blocked mail exactly why it was blocked, who is responsible for it, and who refused to do something about it. Step 3 usually results in a complaint by someone paying for a service to the one providing that service, and thereby in a belated success of either step 1 or step 2. Specifically, I have convinced more than one mail server administrator to stop using Spamcop because it blocked legitimate mail to paying customers of theirs. As Spamcop itself insists: it's never the responsibility of the blacklist operators if a mail is blocked, but always the responsibility of the mailserver administrator who decided to use that blacklist.
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