Filter evasion starts from the belief that if you can get the right email in front of the right person at the right time they'll buy from it - and if that's just 1% of the emails you send that's enough to make it profitable and it doesn't matter how the other 99% of recipients perceive it.
Deliverability is based on transparency, making it easy for a mailbox provider to recognize a mail stream. Consistent authentication, and a clear connection to the sender's corporate domain. Clear, unobfuscated content in the body of the email that's easy for content-based spam filters to.
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