These often compact agencies or single experts are specialized in email deliverability. Making sure that the email hits the inbox. They are able to solve deliverability (email goes to spam!) problems. Think about managing on-premise or their own servers, or otherwise once there is some real concern / problems with email deliverability, blacklisting, etc.
Email marketing has evolved rapidly alongside the technological growth of the 21st century. Prior to this growth, when emails were novelties to the majority of customers, email marketing was not as effective. In 1978, Gary Thuerk of Digital Equipment Corporation (DEC) sent out the first mass email[1] to approximately 400 potential clients via the Advanced Research Projects Agency Network (ARPANET). He claims that this resulted in $13 million worth of sales in DEC products,[2] and highlighted the potential of marketing through mass emails.
Hi Scott, yes that is correct. Most platforms will not let you upload large customer lists if you do not have specific opt-in dates. However if you can provide the data when the user opted in to receive email notifications from you, then you would be able to import the list. These rules may vary based on different providers, but this is exactly the process for switching email service providers (you have to import customer list in the new provider).

In the article, we have discussed 5 – most accepted marketing tips in the context of email. These tips will help to generate leads and convert prospective clients into an actual one. There are many more aspects that needed to be taken care of for but these are the basics email marketing tips which will provide a solution to the question of how to write an email.
Very well written article! Thanks for sharing!!! Just that I would add another tool to this list- intellyMail.com. It is really one of the best email marketing tools that I have come across. intellyMail eliminates the need of manually sending bulk emails through an automated process, thus saving you time and money, besides helping you generate leads
The first autoresponders were created within mail transfer agents that found they could not deliver an e-mail to a given address. These create bounce messages such as "your e-mail could not be delivered because..." type responses. Today's autoresponders need to be careful to not generate e-mail backscatter, which can result in the autoresponses being considered E-mail spam.
An impression in most of the cases cannot be created by one attempt. Here consistency is the key. If you are not consistent you will fail to make your mark in the mind of the customer. Here a threat of being a spammer is most prevalent but if you are using legitimate options you can overcome it. So work hard to keep yourself regular as doing so almost always leads to a greater number of sales.
The first autoresponders were created within mail transfer agents that found they could not deliver an e-mail to a given address. These create bounce messages such as "your e-mail could not be delivered because..." type responses. Today's autoresponders need to be careful to not generate e-mail backscatter, which can result in the autoresponses being considered E-mail spam.
Not only is InVision's newsletter a great mix of content, but I also love the nice balance between images and text, making it really easy to read and mobile-friendly -- which is especially important, because its newsletters are so long. (Below is just an excerpt, but you can read through the full email here.) We like the clever copy on the call-to-action (CTA) buttons, too.

If you’re managing a list in the hundreds, thousands or low tens of thousands and you only collect leads through the internet, then there’s no better service than Aweber. Aweber doesn’t really allow you to add leads from offline sources. However, for online lists, Aweber sports the best deliverability ratings on the market. If you’re primarily using online opt-in forms, use Aweber. Your emails will get delivered, opened and clicked on.
This is a really good article and quite resourceful as well. I use an email marketing app called MaxBulk Mailer. It works great and I love it’s functionality. However, I have a difficult time using it to send mail messages to my Yahoo.com members. Yahoo has placed a block to deflect email marketing apps. I’ve recently been substituting by sending email to my list of Yahoo.com users through MailChimp. I like MailChimp, however finding a SMTP service provider who doesn’t conflict with messages sent to Yahoo users would be fantastic. Any suggestions would be greatly appreciated!
The first autoresponders were created within mail transfer agents that found they could not deliver an e-mail to a given address. These create bounce messages such as "your e-mail could not be delivered because..." type responses. Today's autoresponders need to be careful to not generate e-mail backscatter, which can result in the autoresponses being considered E-mail spam.
www.campaigner.com (Not Free - But 30 Day Free Trial): A well priced and one of the most versatile autoresponder and email marketing online tool available in the current market. Has more than 500 email templates, mobile and social network ready and can give you detailed reports to measure the effectiveness of your email marketing campaign effectiveness. .
Professional email marketing software offers you the tools to track results so that you can better understand customer behavior. This allows you to set customized messages, as well as to A/B test your messages so that you can constantly fine-tune your marketing campaigns. Let’s say, for instance, that you want to find out which is the best auto-responder for your high-rolling segment of customers. You can set different options, compare auto-responders, and make an informed decision. Sendinblue also features marketing automation, and its wealth of plugin capabilities make it easy to maximize your email campaign. 
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