Reading aloud can help you catch copy errors and ensure your emails are professional and legible.
Proofreading from the bottom up is another tactic; starting at the end of the email and reading each sentence in reverse order discourages your brain from focusing on ideas instead of grammar. It doesn’t hurt to run your work through the spellchecking tools included in your email or word processing tools or to use add-ons such as Grammarly or Hemingway Editor.
3. Leave out jargon and acronyms
Most industries use insider jargon and acronyms, but you should only include them in your emails if you’re sure your readers understand them. Even so, it’s best practice to write acronyms in full on first use or to replace them with common terms so there’s no room for confusion.
4. Stay consistent
Maintain your brand voice across messages and platforms to ensure brand consistency. Adapt your brand tone—the way you talk about specific subjects—when necessary.
For example, let’s say you have a lighthearted, joke-y brand voice, but your company just experienced a data breach that affected your email subscribers. This is the time to be serious.
5. Keep emails brief
Keep your emails as short as possible to encourage engagement and completion. There’s no set rule for optimal length—which will vary by subject matter and audience—but many brands see success by sticking to one topic, such as a restock announcement or sale. Keep your readers engaged—and willing to read your entire email—by keeping your messages short. There’s no set rule on how long your marketing emails should be, and the optimal length will vary depending on your subject matter and audience.
This short email from tinned fish brand Fishwife succinctly promotes its starter pack and contains only necessities: CTA buttons plus an image and brief product description.
Reference: https://www.shopify.com/ca/blog/email-marketing-best-practices