Editing Anti-spam techniques (section)

===Confirmed opt-in for mailing lists===
{{Main|Opt-in email}}
A malicious person can easily attempt to subscribe another user to a [[mailing list]] — to harass them, or to make the company or organisation appear to be spamming. To prevent this, all modern mailing list management programs (such as [[GNU Mailman]], [[LISTSERV]], [[Majordomo (software)|Majordomo]], and [[qmail]]'s ezmlm) support "confirmed opt-in" by default. Whenever an email address is presented for subscription to the list, the software will send a confirmation message to that address. The confirmation message contains no advertising content, so it is not construed to be spam itself, and the address is not added to the live mail list unless the recipient responds to the confirmation message.