Double Opt-In Process
With a (single) opt-in process, an address is automatically added to the relevant email distribution list as soon as it’s submitted, for example through a sign-up form at a website.{note0} With double opt-in, the submitted address is not immediately added to this list. Instead, an email is first sent to the address, requesting confirmation that this address should indeed be added to the list.
If the recipient of the confirmation request does nothing, then the submitted address is rejected. The address is only added to the distribution list if the recipient responds to the confirmation email.
{anchor0}* The problem with a single opt-in process is that anyone who knows your email address can add you to a particular email distribution list. There is no way to know whether the owner of the email address in fact the one opting-in to the particular communication.
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