Simple Text email 📧 Vs Designer HTML Email🎨. Which one converts better?

hey Jitesh. We've sent millions of emails on ZooTools, and I can tell you this is a tricky question and I totally feel you on this! my TL;DR, for your onboarding sequences and welcome messages ALWAYS use text-plain emails. Sending text plain emails for new users is one my fav hacks that I recommend to every client! This will both feel like you are actually sending them (most likely place your emails in "primary inbox" and avoid triggering spam filters since no complex HTML) and on top, if you are strategic on the email content and subject, you can easily boost up engagement metrics like replies, and CTR which will help to improve email deliverability. I suggest making these emails feel like you're manually sending them over and also asking questions/opening up the conversation about their business, struggles, feedback, etc. Based on our customer data, if you customize emails with personalization and merge tags, you can increase open rates and engagement from 15-35% depending on the industry and type of email. as for whether you should never send highly designed emails. It should be more of a brand preference IMO. Of course, it's well known that spam filters look up for things like "ratio of images vs. text", "engagement metrics", your deliverability reputation, past campaigns, or if your HTML is complex (among other things like your domain verification, security, spammy words, etc). However, most of the time if you make your HTML templates simple and the email content is relevant to your audience you should be good! of course, if your brand is like Nike or Apple, sending text plain emails would actually feel like a scam, so that's something else to take into account in case you are further interested in learning more about email deliverability (which I'm so passionate) i'd recommend reading this guide I wrote with 17 tips: https://zootools.co/learn/tips-i... Hope it's helpful! send me any questions over.