Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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The standard is to retry for 5 days before bouncing emails as undeliverable (and send a warning message that the email hasn't yet been delivered after 4 hours). However, every server can configure it to be whatever they want, so there's no guarantee.
You can't just use any old provider as a secondary mx, you need a server which is configured to accept mail for your domain but not try and deliver it locally. It's pretty simple to set up. The biggest issue is that you need the same spam protections on the secondary as on the primary, as spammers will send directly to the secondary to try and bypass spam protections.