On 25 Jul 2010, at 18:50, Alban Hertroys wrote:

> Hello,
> 
> I posted a couple of days back about this issue already, but didn't get any 
> replies - may have been because I wasn't subscribed yet.
> 
> In the meantime I switched to training via the Dovecot plugin (which requires 
> the signature to be in the header). I'm using DSPAM 3.9.0 from ports (FreeBSD 
> 7.3).
> 
> I'm seeing this in my logs:
> 
> Jul 25 18:36:52 solfertje dspam[72733]: Signature retrieval for 
> '3,4c4c60f8286211026045283' failed
> Jul 25 18:36:53 solfertje dspam[72733]: Unable to find a valid signature. 
> Aborting.
> Jul 25 18:36:53 solfertje dspam[72733]: process_message returned error -5.  
> dropping message.
> 
> So it successfully extracts the signature from the mail, but can't find it in 
> the database.
> While the database (PostgreSQL 8.3) says:
> 
> dspam=> select uid, signature from dspam_signature_data where signature = 
> '3,4c4
> c60f8286211026045283';                                                        
>   
> uid |         signature         
> -----+---------------------------
>   3 | 3,4c4c60f8286211026045283
> (1 row)
> 
> So the signature is there! What's happening?!?


I researched this some more by turning on more verbose query logging on my 
dspam database, and it turns out the signature lookup is failing to get results 
from a query in _pgsql_drv_getpwnam(), namely:

SELECT uid FROM dspam_virtual_uids WHERE username='user'

For some reason dspam is looking up a user as 'user', while the 
dspam_virtual_uids(username) column contains usernames รก la 
'[email protected]'.


My dspam.conf contains:

ParseToHeaders on
ChangeModeOnParse on
ChangeUserOnParse user

(Not all of these options are documented BTW, I had to look up the possible 
options in the source!)

So it should be using my system username ('user') all the way, shouldn't it? 
Instead it seems that it uses '[email protected]' when invoked from Postfix, 
while it uses 'user' when invoked from Dovecot (or, probably, when I forward 
mail to '[email protected]').

Any idea what's causing this discrepancy and what I can do about it?

Alban Hertroys

--
If you can't see the forest for the trees,
cut the trees and you'll see there is no forest.


!DSPAM:1126,4c4d5c52286211783268853!



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