crazydomains.com.au – is not permitted to relay through this server without authentication

Recently had a customer use crazydomains for their Emails. Incoming email stopped with the error below

550 Please turn on SMTP Authentication in your mail client. mail-wm1-f50.google.com [209.85.128.50]:38049 is not permitted to relay through this server without authentication.

I check the MX / NS servers to make sure they were pointing a valid records.

Called support and they asked me to remove off Automatically Detect and change to Local Mail Exchanger , it took 15 minutes to apply and starting working again. Guessing their internal DNS had an issue

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Tags: 550, Bounce back, crazydomains.com.au, email, filter.austweb.com.au, incoming email, is not permitted to relay through this server without authentication, Local Mail Exchanger

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