This is a great article from Glass Door about how to be better at sending emails, especially when it comes to cold emailing about a possible job opportunity.One additional thing I would recommend to everyone, and especially those who have English as a second language, is to try out Grammarly.
Grammarly works in the browser for web based emails, as well as in Outlook and across MS Office products. It keeps track of your writing and offers recommendations when you misspell words, and it lets you know if you've missed/misplaced a comma or apostrophe. Each month it gives you an overview of where you're making mistakes so you can work on improving areas of your writing.
Geez, sounds like I'm selling it, right? I'm not, but it has been super helpful for me and I can't recommend using it enough.
“In today’s fast-paced work environment, it can be easy to type up a quick email and not think twice before clicking send so that you can get on to your next task. However, sending emails that are well-written, thoroughly thought-out, and free from spelling/grammar errors is essential for not only preserving your personal brand, but also for ensuring that the recipient focuses on the content of the message, and not the way it is or is not written,” says Lisa Philyaw, Analytics Coordinator at organization and leadership development consulting firm FMG Leading.