มี plugins ชื่อ Newsletter subscription optin module
Author: Max
Enables widget ready sidebar forms for newsletter subscription, single opt-in and double opt-in options. Stores subscribed email addresses, purges automatically old email addresses. Customizable sidebar appearance, customizable texts and labels. Add up to 15 custom fields to gather all the informations about your users that you need for your email marketing campaigns.
Complatible with SendBlaster Pro bulk email software (any version).
Widget sidebar forms for newsletter subscription is also compatible with SendBlaster Free Newsletter software. Enables mailing list Email merge.
Features
* Stores subscribed email addresses
* Purges old email addresses.
* Customizable sidebar appearance,
* Customizable texts and labels.
* Adds up to 15 custom fields
Plugin Options
* Mailbox setup for managing subscriptions
* Message to subscriber - subject
* Message to subscriber - content
* Double Opt-in
* Link Love (enable and disable)
* Front side messages
* Front side appearance and custom fields
* Temporary database storing for newly subscribed members
ดาวน์โหลด
http://wordpress.org/extend/plugins/newsletter-subscription-double-optin/
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