Which three strategies would improve their email deliverabihty?

Northern Trail Outfitters (NTO) has been sending emails for about 10 years. A new marketing manager noticed their deliverabihty continually decreased over the last year. NTO wants to grow their existing subscriber base and increase ROI on email marketing by improving engagement with subscribers.

Which three strategies would improve their email deliverabihty? Choose 3 answers
A . Exclude old or inactive email addresses.
B. Ensure the spam complaint rate is between 1% and 3%.
C. Purchase lists from companies that guarantee users have opted in.
D. Encourage subscribers to add the company’s sending domain to their contacts.
E. Authenticate email sending to distinguish it from spammers.

Answer: A,D,E