Mail Delivery Failed

[articulatedthoughts]

I installed XenForo yesterday and already love it. I'm new to self-hosting and webmastering, so I apologize if this question is rudimentary. I looked this up and couldn't find anything to help.

I had an influx of new users yesterday migrating from another site. About half of them received the email confirmation notices and the rest did not. Because I was importing a lot of new users, I turned off the email confirmation requirement. I checked my ACP and found that server errors were logged...

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Mail Delivery Failed

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