When a new client subscribes, a welcome email is your opportunity to engage him as your permanent client. It works as a positive gesture and it’s the right time to keep him engaged for long periods of time. You can ask him to take your required action. A welcome email is not an ordinary email, it must have some features. Look at them here https://www.campaignmonitor.com/resources/.
• Send the welcome email immediately, when a person subscribes. You can use an automated email delivery system for this purpose.
• The subject line of the welcome email should be very clear. Use the word “welcome” clearly.
• Welcome email must name personalized effects. Include the name of the subscriber in the email, to give him special feeling.
• Use your welcome email as a guideline. Tell your subscriber about his other options, what he can do next.
• Offer something special as a welcome gift. It can be a voucher code or special discount.
• Give your social media accounts in your welcome email and ask your subscribers to follow them. Give them some exciting reasons to do so. You can offer some exclusive offers for the followers.
• Request the subscribers to add you in their safe list, to make sure your emails are received in the inbox and they are not channeled to trash.
• Although we don’t want the subscribers to unsubscribe, but it’s important that you add an unsubscribe link in the email. However, if they want to unsubscribe, ask for the reason. It will help you to know about the short comings.
• Ask the subscriber to refer you to his friends as well. You can give a link to make it easy for your subscribers. You can also offer some advantages to clients, if they do so.
• Pop up visuals can make your welcome email attractive and catchy. You can use the colors of your brand. But using other colors is not forbidden. The aim is to make your email catchy.
https://www.campaignmonitor.com/resources/infographics/10-essential-elements-of-a-welcome-email/ you can check the infographic here, which gives details about these points. You can use this information to create a quality welcome emails, which is effective too.