Use When migrating lists from TOAD to Sympa, use this message to send to a migrated list.
Replace the word 'blah' with your list name - provided your list name stays the same.
Subject: Mailing list address change
...
E-mail sent to the old list address will bounce with a helpful message reminding the sender of the new address.
You can manage your membership at https://lists.geant.org/sympa/info/blah