A safe email testing tool for staging and development, Mailtrap enables you to inspect and debug your email samples before delivering them to your customers. It helps you keep your email messages clear of spam filters and test HTML elements for compatibility with popular email clients. The Mailtrap blog also offers helpful information such as reviews of email deliverability testing tools.
If you want your audience to remain engaged with your content, you need to make sure you’re offering something of value. For some readers, that means offering a special discount or an exclusive promotion to your email list. For others that could mean offering a how-to article from your blog or a piece of content that’s more than just the typical sales pitch.
Woodpecker is an email tool that enables you to send cold email outreach and inbound lead nurturing email messages and follow-ups automatically, but one by one as if you were sending them manually. If you get a reply, further follow-ups are automatically stopped. Replies from different address, forwards and autoresponders are also detected. Personalize cold emails, track clicks and opens, and collaborate with your team.

The most advanced email marketing services offer custom workflows where you can specify triggers based on actions (such as opening an email or making a purchase) or on inaction (such as ignoring emails). With these services, you can also set up a series of emails (such as tutorials) to be sent to segments of users, and you can pause or stop a campaign at any time. You can also move contacts into new segments once they have completed tutorials.

Mailing lists are often rented or sold. If rented, the renter agrees to use the mailing list for only contractually agreed-upon times. The mailing list owner typically enforces this by "salting" (known as "seeding" in direct mail) the mailing list with fake addresses and creating new salts for each time the list is rented. Unscrupulous renters may attempt to bypass salts by renting several lists and merging them to find the common, valid addresses.[1]
What I most like about Rejoiner is the shared accountability over results. Many brands spend large sums of money on email marketing software, only for the accountability of results to be on their internal team. With Rejoiner, this is flipped on its head, where the company providing the software shares the responsibility for driving incremental revenue. 
Listwashing is the process through which individual entries in mailing lists are removed. These mailing lists typically contain email addresses or phone numbers of those that have not voluntarily subscribed. An entry is removed from the list after a complaint is received. Only complainers are removed via this process. It is widely believed that only a small fraction[citation needed] of those inconvenienced with unsolicited email end up sending a proper complaint. Because most of those that have not voluntarily subscribed stay on the list, and only the complainers stop complaining because they are removed, this helps spammers to maintain a "complaint-free" list of spammable email addresses. Internet service providers who forward complaints to the spamming party are often seen as assisting the spammer in list washing, or, in short, helping spammers. Most legitimate list holders provide their customers with listwashing and data deduplication service regularly for free or a small fee.
Set your target audience. Audiences can be split up in a variety of ways including gender, age, geographic location, or buying habits. Before you send your blast, you want to make sure that you can segment people into different lists so you can target your blasts to the right people. Consider what demographic you want to target, and what they will need to fulfill your call-to-action.
Looking to have more control over your email design? You have the option to code your own HTML template and import it to Mailchimp. We even have our own template language so you can create templates that are editable in the template editor or campaign builder, and we recommend making your layouts 600 pixels or 640 pixels wide to ensure they’re displayed properly across email clients.
Take advantage of the email template designer or upload your own. There are also tools to segments lists and personalize emails with all your contact data. The A/X testing feature allows you to test up to ten different versions of your email before you decide which one stands out as the best. A campaign comparison tool pits your previous campaigns against the current one to give a complete picture.

We suggest sending an email at least once a month to keep your subscribers engaged, but don’t feel you need to commit to this immediately. And be sure to look ahead and plan accordingly if you think your sending frequency will change for special events and holidays—you don’t want to surprise customers if you typically send once a month but suddenly start sending a stream of emails leading up to a Black Friday sales event.
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