We've occasionally got bounces like "554 5.7.1 Service unavailable; Client host ... | Hacker News

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		Maxious on Oct 17, 2017 \| parent \| context \| favorite \| on: MailChimp vs. Amazon SES – How I Reduced My Monthl... We've occasionally got bounces like "554 5.7.1 Service unavailable; Client host [54.240.27.56] blocked using dnsbl.sorbs.net". Amazon say SORBS is worthless but unfortunately someone is still using them https://docs.aws.amazon.com/ses/latest/DeveloperGuide/blackl...

spronkey on Oct 20, 2017 [–]

Seriously, doing bulk emailing you find that mail services are often the dustiest, cobwebbiest things on the internet. I swear some of these things have been sitting untouched for literal decades.

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