What should I do to ensure that my email marketing campaign doesn't get marked as spam?

Not getting marked as spam is part of improving open rates, so you can find many articles on this. From my experience, what you can do fall into two buckets: 1. Technical - look up DMARC, DKIM, and SPF and configure these. Use a reputable email sender. Throttle your campaign so it is spread over some time. 2. Social engineering - when your users sign up prime them to open your email and click something (eg your first email will be sent in two minutes, please reply with X so we can confirm your address). If they open and reply, Gmail and other providers won't mark you as spam. You must include an unsubscribe link - this reduces the likelihood of a user marking you as spam.

Generally i change subject line for each email .... Not sending all email at a time .... Must use some time gap before send (if bulk) ...... use proper format like use first name, last name in email.

Don't use tracking links.

Hey Alex, Emails land in spam due to various reasons - low deliverability, poor targeting, low historical engagement, spam triggers in emails and many such reasons. To improve inbox placement rates, you'd have to look at the different aspects of email marketing - both technical and non technical. For the same, we've created a structured, organised challenge that covers them all in 21 days. If you can spare 45 mins everyday, I'd suggest the 21 Day Email Mastery Challenge to improve your email campaigns. It'll keep it out of the spam folder as well https://www.producthunt.com/post...

To ensure your email marketing campaign doesn't get marked as spam, use a reputable email marketing platform, segment your audience and personalize emails, provide valuable and relevant content, maintain proper email list hygiene, avoid spam trigger words, comply with email laws like the CAN-SPAM Act, ensure your IP address is not blacklisted, and encourage your subscribers to add you to their contact list.