I am currently debating the value of this -- i think a limited number of browser alerts would be more effective. B2C
Now! fast and dirty to a currently opt-in audience. Flash sales, live events -- some immediacy and value to the consumer. Not telling every one how great you are in a spammy email they delete or report as spam and filter in gmail LMAO -- that is what most do I think with spammy email.
Immediacy and some value proposition works -- the rest is trash
Spam filters and spam policies are a real headache.
It really depends on your market targets;
Old people read their email, then forward that crap.
C2C referred email may be the best referrals ... Old people still have the most disposable income but for porn? Sell penis pills in your emails
Business people , like myself, will subscribe to relevant newsletters, sent by topic specific aggregators or vendors of interest. B2B
These can be very high value -- the Nginx newsletter is a good example -- selling enterprise support -- long term added revenue.