If you use a list that does not support the mailing list removal of users requesting to be removed, make sure that you remove them. It just isn't worth keeping them. 3) Do not provide adult material or content in your emails. Since it can be hard mailing list to determine the age of the email recipient, many complaints may arise from these types of emails. Stay away from controversial issues too!
You do not necessarily need to use mailing list pop-ups to build up your mailing list. It's not just about building a list anyway... you need a list, traffic, and offers all together. So why use a pop-up to build up a list if it hurts your traffic? If you really want mailing list to experiment with new ways to get traffic and subscribers on your blog or web page, experiment with footer ads and with your comment form.
Footer ads help to build your list, and they are similar to pop-ups, only they appear as if they're part of your site structure, taking up a lower portion of the browser window. These perform well simply because they are less commonplace than mailing list pop-ups so they are more noticeable. You can also show the footer ad along with the popup, making it appear at different intervals than the pop-up, just so your visitors don't become immune to what you are offering them.