Two ways: for clients who have thier own mail servers and need to relay and for people with Linux laptops who can run posfix or exim we permi relaying based on TLS certificate presented by the MTA. For those who use Windows based dekstops: pop-before-smtp daemon. All others get greylisted: http://en.wikipedia.org/wiki/Greylisting Cheers Tomasz Ciolek On Sat, May 30, 2009 at 02:54:16PM +0700, Sthu Deus wrote: > Good day. > > > If You use an email relay service, how do You protect it: VMs, iptables > connections rate limit, ... ? > > Personally, I have a problem with email sending authorization - how I can > separate the users that have not their boxes on our service and therefore I can > ban their trials to pick up a password - I can not reduce it even to the local > net IPs bt iptables - as port 25 is used for not only for sending our own users > but for receiving it for the local users - as I understand. > > > Thank You for Your time. > > > -- > To UNSUBSCRIBE, email to debian-security-REQUEST@lists.debian.org > with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org -- Tomasz M. Ciolek ******************************************************************************* tmc at vandradlabs dot com dot au ******************************************************************************* GPG Key ID: 0x41C4C2F0 GPG Key Fingerprint: 3883 B308 8256 2246 D3ED A1FF 3A1D 0EAD 41C4 C2F0 Key available on good key-servers *******************************************************************************
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