Changes happen, even if you don't keep up

"The problem is that the person asking the question is only looking at things from their own perspective. They didn't change anything, so of course nothing changed. This point of view is inherently self-centered, thinking that the only thing that matters is the sender. It demonstrates a failure to understand one of the core concepts of SMTP. Each side of a SMTP transaction pays for email."

"The senders pay all their costs, but the receivers also experience costs to delivering mail. In fact, many of the costs a receiver experiences (spam filtering, for instance) are due to bad senders not through any choice of their own. Some could actually argue that the primary costs of email are borne by the people who receive the email, not the people who send it. It's certainly more true that bulk senders profit more from email that the large receivers."

"Back in the day, there was an old argument about who funds the US Postal Service (USPS). Does bulk mail subsidize the cost of non-bulk mail or does non-bulk mail subsidize the cost of bulk mail? This would usually come up when some spammer would wander into anti-spam discussions and start on about how we shouldn't block spam because it was cheaper (and more environmentally friendly! savetrees.com) than bulk postal mail."

Many senders assume unchanged sending behavior means delivery issues are inexplicable. SMTP obligations create costs for both senders and receivers, so recipients can change filtering or acceptance policies that block mail. Receivers incur significant expenses such as spam filtering that arise from other senders' practices. Bulk senders commonly profit more from email while large receivers absorb most delivery costs. Historical postal debates compared who subsidizes whom in mail delivery, but postal systems can centrally control delivery mechanics and mailboxes. That centralized delivery control in postal systems differs from SMTP, affecting how costs and delivery responsibilities are allocated.

Read at Wordtothewise