On 2009-03-23, jmc <j...@cosmicnetworks.net> wrote: >> In getting our low traffic email server running, the first thing I >> noticed while following the logs that sites like gmail et al will >> retry a message from a different host. Sometimes gmail will send >> once, try again very soon again from the same host and then queue it, >> but the queued email might be sent by a different server. > > check greylisting.org.
it's useless. it doesn't list common pool senders from a block of /24 or less (i.e. most of them) and it's not updated regularly. dnswl.org is better but it's a damn big list and if you load it into a PF table, even if you aggregate the addresses, it uses a huge chunk of kernel memory.
