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Is there any research that has given us percentages of the same sort for email marketing?
Is this percentage different for newsletters vs. emails?
Is this percentage different for text vs. html newsletters?
Good warning! Anyone dealing in quantities of email (or even replies to email from large websites) should heed it. There is a substantial network of blacklists out there, and it's easy to get in --not so easy to get out. Here's just one.
If you run your own mail server, you can configure it to utilize our list, if you'd like to refuse mail from these types of servers. Please note that if you do this, you may also refuse some legitimate (non-spam) mail, as some "bad" servers may also have good users on them. (It's unfortunate that one bad apple can sometimes spoil the whole bushel.)
If you're renting a list from a vendor the vendor usually overdelivers to make up for undeliverable addresses. On one campaign that I recall we sent out about 7,000 emails, 1,000 of which were undeliverable. That's about 14%. Keep in mind the difference btwn undeliverable (bad address) and bounce (full mailbox). There shouldn't be much of a difference for newsletters vs. emails, nor for text vs. html.