Here’s an interesting chart from the team at MarketingSherpa, about the different methods marketers use to improve email deliverability rates.

Some of the most popular options included:

• Provide an easy unsubscribe process: 62% 
  
• Measure and remove hard bounces: 51%
• Clean lists regularly: 41%
• Remove inactive subscribers: 39%
• Maintain an opt-in only subscriber list: 39%

Which tactics do you find most effective for improving email deliverability rates?  Which do you think are essential marketing practices?