The software managing the list will answer with a message containing a text along these lines:
To confirm that you would like email@example.com added to this mailing list, please send an empty reply to this address: firstname.lastname@example.org Your mailer should have a Reply feature that uses this address automatically. This confirmation serves two purposes. First, it verifies that I am able to get mail through to you. Second, it protects you in case someone forges a subscription request in your name.To confirm your subscription, you should answer with an E-mail (again, its content is unimportant) to the given address. In the example above, it is email@example.com, but the 950281983 and mgoifceebaalgongomon parts will be different in each particular case. This makes forged subscriptions virtually impossible.
The software tries to determine your E-mail address and tells you what it think it is (it would be firstname.lastname@example.org in the above example). It may happen that you would like to use another address (e.g. because it is your physical address email@example.com and not your logical address firstname.lastname@example.org). You can do it by changing the @ sign to a = sign in the address you would like to use and putting this before the @ sign of the subscription address. As an example, to use the address email@example.com, you would send a message to:
Moreover, only members of the list are allowed to send messages to the firstname.lastname@example.org list, the control being based on the sender's e-mail address (to submit messages to the list, you should therefore be careful to use the same address you used to subscribe to the list.)
In case you subscribed with an explicit address (e.g. email@example.com), you would use instead:
Just as in the subscription procedure, you will receive an answer requesting that you confirm your wish to unsubscribe by sending a message to a a complicated address. The purpose of this is again to avoid being removed from the mailing-list by a malicious person.
Every time you send a message to the list, you will receive a message with a reminder that this is so.