How to check for existing mail accounts?

[Brendan Pirie]

Kevin Miller wrote:
> Johnny Stork wrote:
>> its sendmail
>>
>> Kevin Miller wrote:
>>> Johnny Stork wrote:
>>>
>>>> I have noticed a large increase in the amount of spam coming in to
>>>> MS (latest) running on CentOS 5 and many are coming into
>>>> non-existent email accounts. Is there a check that can be done for
>>>> the existence of an account first, and then if non-existent, block
>>>> even before any scanning is done, let alone processing through MS.
>>>>
>>>> Thanks for any suggestions that anyone can give
>>>>
>>> What MTA are you using?  You can run recipeint verification on
>>> sendmail via milters, and I'm sure Postfix has similar
>>> functionality... 
>>>
>>> ...Kevin
> 
> Then see http://smfs.sourceforge.net/smf-sav.html
> 
> Note that this does both sender and recipient address verification.  I
> presume your gateway is forwarding on to another host where the
> recipients actually reside.  The milter uses ldap calls to get the
> recipient data, so your internal email server will need to be able to do
> that.  Ours is Exchange, which does.
> 
> HTH...
> 
> ...Kevin

Correction - smf-sav milter does not use ldap.  It uses the call-ahead 
method, so ldap is not required (one of the reasons I chose it).

Clarification - smf-sav milter is capable of doing both sender and 
recipient address verification.  Sender verification can (and in many 
cases should) be disabled.

Brendan