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"I find IP based mail blacklist services such as BRBL obsolete and possibly harmful"

Fully agree to this. I've always wonder why spam filters don't place more importance on domain reputation. So many senders runs on the same IP for deliveries and it's really silly to blatantly block someone based on IP.

For example, $89.95/mo is the starting price to get a dedicated IP for sending with Sendgrid.

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If the smtp server is allowing spam to be sent through it, then it is not trustworthy. It doesn't matter which domain it was sending on behalf of. Though the real reason is that we've only had spf records and what not for a relatively short amount of time, so most systems are designed from the perspective that you can't trust the domain a message is claiming to be from.

It is hard to fool an IP-address-based blocking system. Because it's easy to fake a domain name, but hard to fake an IP-address

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