When you send email from a real person, your email open rate increases. Plain and simple. This is because -- based on past tests we've conducted -- recipients are typically more likely to trust a personalized sender name and email address than a generic one. People are so inundated with spam nowadays, they often hesitate to open email from unfamiliar senders -- and they're more likely to trust a personalized sender name and email address than a generic one.
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. 

Whenever possible, add a personal element to your emails. Most email tools allow you to enter shortcodes that will be replaced with the recipient’s name when the email is sent out. Emails from Treehouse Co-Founder Ryan are always fun and personal. The subject lines are creative, messages are sent "from" Ryan's email address, and the content is personalized. If you reply to the mail, you'll even get a prompt response from Ryan himself!
A common example of permission marketing is a newsletter sent to an advertising firm's customers. Such newsletters inform customers of upcoming events or promotions, or new products.[12] In this type of advertising, a company that wants to send a newsletter to their customers may ask them at the point of purchase if they would like to receive the newsletter.
Rob, you don’t say who ‘booted’ you from using it. A significant GDPR factor is non-profits having to consent/re-consent those on established email lists and experiencing significant proportions of lists being lost because people miss the notifications or are too busy to fill in yet more forms. However, I have found a few using a ‘one-touch’ re-subscription button that takes immediate effect, without the recipient having to do anything else. It would appear that the re-subscription rate is higher, the easier it is to activate. On enquiry, I was told that they were using mail chimp for this.
Another way to extend the clicks on your email beyond its shelf life is to prompt your audience to forward the offer. The folks at Litmus found that the most forwarded emails were 13X more likely than the typical email to include “Share With Your Network” calls-to-action. By including forward-to-a-friend (or social sharing links, as we discussed above), you put it in recipients' minds to share. 
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