Allow LSD mailing list participants to send mails with the list address

[matze]

Incoming mail for deployment-suport@adblockplus.org is distributed to various colleagues, each of whose specialized in answering different type of questions (Simona: general, Matze: tech, Henning: something in the future).

Unfortunately, we cannot answer those mails using deployment-support@adblockplus.org as sender address. That means we are forced to propagate our individual mail addresses, which is not always what we want. Also, it makes synchronization between us quite difficult (it's too easy to forget to set the list address in CC on every reply) and often leads to confusion.

Thus please allow the aforementioned colleagues to send mails with that address. However that may be implemented - our only requirements are that we a) do not have to logout/login for that but b) still see what others have sent that way.