Antonio Guerrero wrote:

Actually, our lists name includes a dot '.' in their names (i.e. list.help@domain.com)

'

In our new hosting, they are unable to configure mailman in order to accept the '.' dot character in the list name. If I create a list with a dot in the name it will be created ok, you can subscribe people, but when we send a mail to list.help@domain.com it will not be delivered and says:

This is an automatically generated Delivery Status Notification Delivery to the following recipient failed permanently: list.help@domain.com Technical details of permanent failure: PERM_FAILURE: SMTP Error (state 13): 550 sorry, no mailbox here by that name. (#5.7.17)

This has nothing to do with Mailman per se. This is an issue with the incoming MTA that receives the mail for delivery to mailman.

There are three possibilities that I see.

The first possibility is that list creation requires a manual 'alias' installation by the host and they have not done that, and the problem has nothing to do with the '.', but rather is due to this being a new list and the mail delivery aliases for it not being installed.

The second possibility is that they have some automated way of installing aliases or recognizing list names which is confused by the '.'.

The third possibility is the MTA is configured to treat a '.' in the local part in some special way.

-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan