Re: [courier-users] Weird problem with rejection (511)

[Sam V. <mr...@co...>]

Michelle Konzack writes:

> Additional info to a new error message:
> 
> ----[ command 'grep 00024145.4D473C20 /var/log/mail.log' ]----------------------
> Jan 31 23:48:00 vserver04 courierd: newmsg,id=00024145.4D473C20.000019C8: dns; localhost (localhost [127.0.0.1])
> Jan 31 23:48:00 vserver04 courierd:
> started,id=00024145.4D473C20.000019C8,from=<catchall-electronica@vserver04
> .tamay-dogan.net>,module=local,host=catchall-electronica-lists!mcforum-ssp
> -iic-spi!1015!1015!/home/catchall-electronica-lists!!,addr=<catchall-elect
> ronica-lists>
> Jan 31 23:48:00 vserver04 courierlocal: id=00024145.4D473C20.000019C8,from=<cat...@vs...>,addr=<cat...@vs...>: 511 Headers specify no receipients.
> Jan 31 23:48:00 vserver04 courierlocal: id=00024145.4D473C20.000019C8,from=<cat...@vs...>,addr=<cat...@vs...>: sendmail: Unable to submit message.
> Jan 31 23:48:00 vserver04 courierlocal: id=00024145.4D473C20.000019C8,from=<cat...@vs...>,addr=<cat...@vs...>,status: failure
> Jan 31 23:48:00 vserver04 courierd: completed,id=00024145.4D473C20.000019C8
> Jan 31 23:48:00 vserver04 courierd: started,id=00024145.4D473C20.000019C8,from=<>,module=dsn,host=,addr=<cat...@vs...>
> Jan 31 23:48:00 vserver04 courierd: completed,id=00024145.4D473C20.000019C8
> --------------------------------------------------------------------------------
> 
> I have even tried to send the message manualy using "sendmail -t" but it is  the
> same error.  The weird thing is, I am preparing messages from BaSH scripts since
> more then 10 years and send it with "sendmail -t" but I do  not  understand  WHY
> this message wont send.
> 
> I have the error only on the four mailinglists 
> 
>     mcforum-digital-io-ports
>     mcforum-general-pic32-topics
>     mcforum-sci-usart-eusart
>     mcforum-ssp-iic-spi
> 
> and all others are working fine and I already receive messages.
> 
> Hmmm...  Sam!!!!
> 
> Can it be, that courier does not like the three "-" in the listnames?

Depending on how the mailing lists actually get set up. Addresses with 
dashes are inherently ambiguous. There's nothing wrong with local account 
names containing dashes. "user-foo-bar" may be delivered to either an 
account named "user" or "user-foo", if either account has the matching 
.courier file. Courier looks for an account named "user-foo-bar", then 
"user-foo", then "user", until it finds it, then checks for a proper 
.courier file, in each case.

To prevent an attacker sending an address of the form 'a-b-c-d-e-f-g-h-i…' 
and causing a plethora of calls against the authentication database, and 
overloading it. Courier ignorees any dashes after the first three.