On 11/07/11 20:11, Emmanuel Noobadmin wrote: > On 7/11/11, Ian Eiloart <[email protected]> wrote: >> Ooh, the legitimacy of a mail server on a dynamic IP is pretty low already. >> When it's compromised, I don't think it has much legitimacy left! > > I wasn't thinking so much of mail servers on dynamic IP but spam sent > through valid mail servers such as an ISP from a compromised client, > or a spammer using the same ISP sending spam on a dynamic connection. > > This comes from experiences where my clients' intended recipient > running Barracuda rejects emails because the dynamic ADSL IP in > question (specifically pointed out in the bounce) was apparently > detected to be spamming some time ago.
That's deep header inspection then - you shouldn't normally reject mail because the 2nd or 3rd level of received headers is listed in a DNS block list. That is a common mis-configuration of Barracuda appliances. It means that innocent users of an ISP that has been good and listed all their non-mail blocks in the Spamhaus PBL (for example) are falsely rejected. Many a bad word has been uttered around the world upon discovering email being rejected by one of those systems. -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
