How to check for existing mail accounts?

[Brendan Pirie]

Benedict simon wrote:
>> 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
> 
> Thanks Brenden,
> 
> I jus read ur reply to the above post and did get a some qucik ideas.
> I am using sendmail 8.13 and mailscanner + spamassassain + clamav
>  and also squirrelmail
> 
> can the above milters work with sendmail n mailscanner and will it be
> useful in addtion to my confguration
> 
> apprecite your help and suggestion
> 
> Thanks and regards
> 
> simon
> 

Simon,

milters work with sendmail (or postfix) at the MTA level.  Use of 
spamassassin, mailscanner, squirrelmail, clamav, or any other software 
is not really relevant.  As to whether it will be useful to your 
configuration, that is a decision for you to make.

I implemented it largely because I run a sendmail mail server and a 
sendmail mail gateway, and didn't want to go the ldap route to drop 
unknown users at the gateway.

Brendan