[CentOS] Sendmail SMTP Brute-Force Attack

Fri Jun 15 04:12:01 UTC 2012
John R Pierce <pierce at hogranch.com>

On 06/14/12 5:58 PM, Gustavo Lacoste wrote:
> The problem with my server is: I use it to offer webhosting services. Some
> customers using Outlook are blocked because they use black listed ips (ips
> simply are dynamic).

They should be using smtp auth over SASL, or they should be using their 
ISP's smarthosts for forwarding outbound mail.

john r pierce                            N 37, W 122
santa cruz ca                         mid-left coast