Test subject lines using sendcheckit.com/email-subject-line-tester. Aim for a score above 100 to 105; scores below are not recommended.
Add image URLs when incorporating images in the emailer.
Keep the emailer size as low as possible, preferably less than 1 MB.
Personalize subject lines, e.g., use "Hey {{customer name}}."
Avoid spammy words like Sale, Hurry UP, Hurry now, Last Day, 50% off, etc.
Follow warm-up procedures for the initial 2 weeks.
Segmentation for Campaigns:
Warmup 1: Customers who placed an order once in the last 30 days with a count less than 1k.
Warmup 2: Customers who placed an order once in the last 60 days with a count less than 2x.
Warmup 3: Customers who placed an order once in the last 90 days.
Warmup 4: Customers who read in the last 30 days or 60 days, depending on the number, with a count higher than Warmup 3.
Warmup 5: Customers who clicked in the last 30 days or 60 days, depending on the number, with a count higher than Warmup 4.
Warmup 6: Customers who added to cart, abandoned checkout, and clicked messages of the previous 2 campaigns.