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73416ba
(Get the code!)
There are some severe downsides to the ISBDB:
1) It's controlled by Mozilla, instead of each ISP.
2) It won't work on LANs.
3) It requires intervention on Behalf of mozilla to update information.
4) Only thunderbird uses this information. If each email client had it's own non-standard mechanism, then ISPs would have a huge burden to update each of them with new information when they change their email server.
The other mechanism:
1) Shares point (4).
2) Is inheretly insecure (why HTTP instead of HTTPS?)
While I have nothing in particular AGAINST maintaining support for mozilla's in-house mechanism, I belive that supporting standardized mechanisms (especially RFCs) is ultimately important.