Free email services do cap the number of email messages you can send out per day. This is to cut down on spam messages sent with their services. The cap is generally around 100 messages per day, which is sufficient for keeping in touch with family or other personal email uses. But if you need an email service for business purposes, it may be better to purchase an email service that permits unlimited messages each day.
Next up is building an email newsletter. The best services offer several ways to do this; you can import your own HTML, start from scratch, or use a pre-designed template. Most of these services have drag-and-drop UIs that let you choose exactly the elements you want to include, as well as image libraries in which you can store assets such as your logo or company photos. Tools that let you test your emails for spam are also essential since there are some seemingly innocuous terms that may send up red flags and drop all of your hard work into your subscribers' junk folders or, worse, get your emails banned before they ever reach their recipients.
www.officeautopilot.com (Not Free - But 15 Day Free Trial): OfficeAutopilot is a real COOL tool with mind boggling features that goes beyond and Autoresponder service! The site is very user friendly and they get high deliverability. Apart from sending emails, you can set up post cards and can make pre-recorded phone calls. You can also process orders through their shopping cart. This awesome service does not come cheap but you can have a free trial.
We narrowed the 16 free email services to eight that we believe are the best options. We eliminated services that allow you to send free email messages but won’t let you receive messages without purchasing the service. We also discounted services that currently have free email accounts available but are either no longer offering support or have plans to discontinue them. We didn’t feel comfortable recommending a service that may not be around long term.
We spent 120 hours testing 16 free email services, narrowing our list to the eight services we believe are the best options. These services have sufficient inbox storage and tools to make it easy to send, receive and store messages. Gmail is our top pick because it’s the easiest to use and comes with the most services, including access to Google Calendar, an attachment preview, automatic spam filters and direct import of social media contacts into its address book.

Hi Bernie, actually time plays 3rd priority position to how you get customers to open your email. #1 is the message - what are you saying to get them to open the email?- on the subject line. #2 is making sure the content gives your customer information and opportunities that engage them into action. #3 is the day or time of day. Then as some have mentioned.. TEST! Be prepared to try different messages and times to see what resonates with your audience. Make sure to choose a service...
Most companies will prefer a third-party solution since not only will these be more capable, they'll also be supported more effectively by related back-end apps, such as mobile device management (MDM) platforms and mobile-oriented endpoint protection solutions. You'll also have an easier time pushing a third-party platform out to registered client devices, though some hosted email providers can help with this step.

But your service provider isn't your only worry. If you've opted for any third-party email integration, like combining your email with a third-party customer relationship management (CRM) provider (such as Salesforce), that opens your company's email up to either data-snooping apps deployed by Salesforce or to any data breaches that originate with that service. So the more informed you can be about what's attached to your email service, how that data's being used and accessed and especially by whom, the better off you'll be when it comes time to send confidential email.

Analytics and reporting: Once you send an email, you'll want to determine how it's doing. Most services provide a range of data, including how many emails you sent, how many of them landed in inboxes, the bounce rate, who opened your emails, and the number of clicks and opens by location. Click-through rate and open rate are two basic metrics all email marketing services should provide. Those are important metrics to track for businesses.  
Email marketing effectiveness is largely determined by your relationship to the subscriber list. Below are some common list relationships, that largely determine how successful you will be. Email Marketing With No Prior Relationship Mostly Dead. While the FDA does allow you to send emails to recipients who you have no prior relationship with, or consent to mail to, nearly every email platform will not allow you to send to subscribers who have not given you permission first....
www.officeautopilot.com (Not Free - But 15 Day Free Trial): OfficeAutopilot is a real COOL tool with mind boggling features that goes beyond and Autoresponder service! The site is very user friendly and they get high deliverability. Apart from sending emails, you can set up post cards and can make pre-recorded phone calls. You can also process orders through their shopping cart. This awesome service does not come cheap but you can have a free trial.
Obviously, it takes more work to create and place guest posts, but it’s worth it if the publication is aligned and authoritative. We found a way to create additional value with this as well by working with internal HubSpot experts who wanted to get their thoughts out on a given subject. For example, here’s a guest post that Blake Toder wrote for the Usabilla blog:

Hi Lexi! Email marketing metrics can differ based on industry. Often times email marketing can be another way to stay in touch with customer and remind them of your great service. I would evaluate your current emails and see if there is too much content in a monthly newsletter. Are people clicking? Are they even opening? Sometimes increasing emails to two a month with one featuring an employee or client testimonial which the other gives customers an offer such as a discount can increase...
dotmailer is a marketing automation platform that empowers B2B, B2C and e-commerce businesses. The software enables marketers in 150 countries to use advanced data to design, test and send powerful automated campaigns. In addition to being a Magento Premier Technology Partner, dotmailer integrates seamlessly with other ecommerce platforms and CRMs.
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