Re: [exim] Dealing with Authenticated SMTP spam

On 27/05/14 19:03, Paul Warren wrote:
> We're seeing a growing problem of spam being sent through our servers
> using compromised authenticated SMTP credentials.
[...]
> We're currently considering rate-limiting, or trying to detect where a
> single user is using multiple IPs in quick succession.

Do you get undeliverables? Bounces? Monitor the rate.

Do they send with multiple envelope-from addresses from the one
account? Monitor that rate.
--
Jeremy