[NTLUG:Discuss] How to dump a list of email addresses from your mail server?

[Daniel Hauck]

No PAM magic.  The MTA will be Postfix.  All users will be local.  What 
is /etc/postfix/virtual?  I will be running three different domains 
though... is that what the virtual stuff is about?  We might wanna point 
me to a howto somewhere unless it's pretty obvious when looking at it 
from Webmin...

I suppose once I figure it out and write it into a script it'll all seem 
easy afterward. :)


David Stanaway wrote:
> We would need to know what mail server you were using  - and how it is 
> configured to help their.
> 
> Eg, are you using postfix with local users, an /etc/aliases and and 
> /etc/postfix/virtual like me? Or do you have something else?
> 
> You can get all your local accounts with
> getent passwd
> unless you have some odd PAM magic happening for your mail services.
> 
> You could get your alias users from your alias files and virtual files 
> with the appropriate dbm flavor util.
> 
> /usr/bin/db4.3_dump -p /etc/aliases.db
>  /usr/bin/db4.3_dump -p /etc/postfix/virtual.db
> 
> 
> 
> You will need some magic to look at that - you would probably be better 
> to use perl or python and its db<X> library.
> 
> The data section of the db_dump is a line for the key, and a line for 
> the value ...
> 
> 
> Daniel Hauck wrote:
>> I'm preparing to deploy ESVA (a vmware appliance for email filtering) at
>> home.  I have been using it at work with fantastic results.  One feature
>> on there that is absolutely necessary is to specify the relay_recipients
>> for Postfix to use, rejecting all other incoming emails.  To simply
>> accept all email for a domain will result in thousands of different
>> random email addresses being sent to my domains, each being filtered and
>> scanned before finally being rejected by the actual email server.  It
>> results in a HEAVY processor load and I don't want it.
>>
>> At work, we have an exchange email server and with a handy-dandy Perl
>> script that does some LDAP magic, I am able to download a list of all
>> email addresses from the exchange server and feed it to ESVA via an
>> hourly cron job.  (This allows me to simply add or delete a user and the
>> list will update itself within the hour automagically)
>>
>> I want to do the same thing at home but the problem is, I don't have any
>> such LDAP thing running at home... I'm all Linux and it's set up rather
>> simply.  So, with that said, what would be an easy way to have the
>> mail/web server I'm loading generate a list of valid email addresses for
>> the domains I'm hosting?  This would be accounts *and* aliases.
>>
>> I suppose performing multiple steps where I scan the passwd file and
>> then the aliases file might work but I'm no shell or perl script wizard
>> to be sure.  So before I do it "the hard way" I'm hoping someone with
>> superior skillz could show me what a dummy I am by showing me an easier way?
>>
>>
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>>   
> 
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