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It does greylisting by default. Greylisting is awesome at cutting down spam, but we recently noticed that it was preventing a major mail provider from getting t
by peterwaller 12y ago
It does greylisting by default. Greylisting is awesome at cutting down spam, but we recently noticed that it was preventing a major mail provider from getting through, among others, because it seems that this major provider doesn't use the same IP twice (at least sometimes).
If ignoring email coming from a major provider isn't an option (it isn't.), then what are your options?
- mhurron 12y agoYou can whitelist from GMail while still greylisting from everyone else. Simply query DNS for their SPF records and use that for the whitelist, Google is good about keeping that up to date. GMail sends from a farm, it's random where the exit ends up being. I only have that problem from GMail, Hotmail and Yahoo don't seem to have this problem.
- stevekemp 12y agoYeah a lot of greylisting is naive and uses "sender", "recipient", and "IP" to discover repeats. If you're going to implement greylisting yourself it makes more sent to hash the sender+recipient pair, allowing IP addresses of the senders to change - which is what will happen with many of the bigger mail-hosts, gmail, hotmail, etc.