The mailing list for listmasters using Sympa

[Gonzalo Palacios Goicolea <address@concealed>]

Hi All,

I'm running Sympa 6.2.16 since 10 days ago, and we have started to 
receive reports at postmaster mail account with subject "Unknown list"

The message itself says it's not posible to distribute message to the list:

bounce+receiver==a==domain==listname@domain

I know it's an alias problem but I tried to replicate old system config 
which was working fine without success.

I'm using postfix as MTA. Please, if anyone has suffered this problem 
and can help me with the solution I would appreciate.

Thanks in advance

Gonzalo