this post was submitted on 08 Aug 2023
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Most mail services will block self hosted mail servers because you have no IP reputation or if you're using a VPS could have an IP that previously ended up on a blacklist.
Most mail service will not outright block email. Most seem to be configured to follow a handful of blacklists and build a reputation.
They might start you marked as spam, but few outright block based solely on IP. Spam filters are far more mature than that these days.