Electronic mailing list servers may be set to forward messages to subscribers of a particular mailing list either individually as they are received by the list server, or in digest form in which all messages received on a particular day by the list server are combined into one email that is sent once per day to subscribers. Some mailing lists allow individual subscribers to decide how they prefer to receive messages from the list server (individual or digest).[2]

Emails triggered by milestones, like anniversaries and birthdays, are fun to get -- who doesn't like to celebrate a special occasion? The beauty of anniversary emails, in particular, is that they don't require subscribers to input any extra data, and they can work for a variety of senders. Plus, the timeframe can be modified based on the business model.
Molly K. McLaughlin is a New York-based writer and editor with more than a decade of experience covering technology. She has tested and reviewed all sorts of software, mobile apps, and gadgets. Before launching her freelance business, she was an editor at PC Magazine, covering consumer electronics, followed by a stint at ConsumerSearch.com, a revie... See Full Bio
Customer.io is an email marketing tool that can be used by various different roles within your business including marketers, product managers and of course, growth hackers. Users can send targeted emails to your visitors on your website or to mobile app users depending on their activity. You are notified when they have read your email and/or if they click on one of the links. It also includes A/B Testing capabilities.
The takeaway here is that if you are to use personalization as an email strategy, do so in a meaningful way. It takes little knowledge or relationship to place someone’s name in your greeting. It shows far greater care to send personalized email that is specific to a recipient’s needs and history. Again, an example from my inbox, this email from Rdio dispenses with the formalities and simply provides an update on music I actually listen to.
Email marketing solutions run the gamut from basic text-based email editors to fully designed HTML or JavaScript templates. Leveraging email for marketing can take several forms, so some packages will attempt to address all of them while others will seek to specialize. For example, some businesses might decide their most effective marketing tactic is a value-add newsletter delivered to a gated community of subscribers. Others might want to tie their emails directly to their product and sales engines, providing special offers and deals to recipients.
Activation: A new user creates an account but, they do not use your product within the first 7 days. Create an  “activation” campaign that sends an automated email with their login information, steps on how they can get started and include a video demonstration for additional support. You can also invite them to a one-on-one meeting to walk them through the product and answer any questions they may have.
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