Re: Sendmail SMTP Brute-Force Attack

["Shiv. Nath" <prabhpal@xxxxxxxxxxxxxxxxxxxx>]

On 6/15/12 2:03 AM, Les Mikesell wrote:
> On Thu, Jun 14, 2012 at 7:58 PM, Gustavo Lacoste<gustavo@xxxxxxxxxxx>  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).
>>
> Give them logins/passwords and only rely if the connection is authenticated.
>

Hi,
The solution Les Mikesell offered is also good option, use sasldb 
function to authenticate before relay.
http://postfix.state-of-mind.de/patrick.koetter/smtpauth/sasldb_configuration.html

Thanks / Regards
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