Developers of Sympa

[Olivier Salaün - CRU <address@concealed>]

The -subscribe alias is commented in the default list_aliases.tt2 
because we consider it might lead to spammers subscribing to mailing 
lists. Subscribing the standard way (mail containing a subscribe 
command) is a complex enough task to prevent spam bots to subscribe to 
mailing lists. But sending a random message to a list-subscribe mail 
address make things easier...

Of course you can imagine what might happen if a spam bot is subscribed 
to a mailing list.

Thomas Berry wrote:
>   I'm curious, why is the sendmail alias <listname>-subscribe disabled
> with a comment (#) when the aliases are added for a list?
>
>   I can get none of the subscribe settings to add the necessary 
> subscribe line to the sendmail aliases file.
>
>   Am I missing something obvious?