The consensus is that Mailchimp is a viable option for newsletter deliverability with a growing subscriber list, especially for beginners and smaller businesses, due to its user-friendliness and built-in features. However, success hinges on adhering to email marketing best practices. Maintaining list hygiene through regular cleaning, building a positive sender reputation, and complying with Mailchimp's guidelines are crucial for optimal deliverability. Technical aspects such as setting up DMARC, SPF, and DKIM are essential for authentication and improving sender reputation. Segmentation is also recommended for targeted and engaging content. As subscriber lists grow and marketing needs become more complex, some users may find Mailchimp's basic plans limiting and may require more advanced features offered by other ESPs. The choice of ESP is not the only determining factor; responsible sending practices are paramount.