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Tested 2 100% working paid SMTP service providers.
Tested the server details on my own and the servers work and send emails fine.

These are the errors I'm getting. No idea what it means. Any idea how to fix?

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Anybody? Still not working, newest version of mybb.

Please, need help with this

Please help me with this.

its rather difficult to trace the cause when the given reason is 0 (zero)
are you using proxy server (like cloudflare) ..

edit: few search results might be helpful

(2018-01-21, 05:19 PM).m. Wrote: [ -> ]its rather difficult to trace the cause when the given reason is 0 (zero)
are you using proxy server (like cloudflare) ..

few search results might be helpful

There is ddos protection on the domain through blazingfast but it used to work so idk if thats the issue. Here's a link to the forums incase it helps: https://penguware.xyz/forum