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| Direct Delivery -
The ability of an email program to deliver email directly to each recipient without using an intermediate mail server. This method defeats efforts to have ISP’s block spammers since the spammers can circumvent the ISP's involvement in the mail process. Direct Delivery, however, is much slower for the spammer because his computer must make each connection individually instead of just once to the ISP's email server. This increases the load on the spammer's computer, while eliminating it for his ISP.
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| Double Opt-In -
Technically, this is when a user has elected to receive an email from a marketer, and then confirmed his/her decision usually by responding to an email confirmation. In practice, however, some less conscientious marketers have looser definitions of double opt-in which can include those who have received more than one email from a spammer but did not explicitely ask to be removed from the spammer's list.
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