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Remote Server returned '<mail.mycompany #5.7.1 smtp; 554 5.7.1 Error: need authentication from mail.client.com>'

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Last Modified: 2018-02-16
Hi People,

I've got this error message today even after registering the SPF record in my public DNS succesfully:

Remote Server returned '<mail.mycompany #5.7.1 smtp; 554 5.7.1 Error: need authentication from mail.client.com>'

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What I'm trying to do is that I wanted to allow Client.com who is our outsourced marketing partner to send out promotion email on behalf of my users mailbox in mycompany.com, I'm using Exchange Server 2013 while the marketing company is on AWS all in cloud.

How to allow this to work ?
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Principal Software Engineer
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Senior IT System EngineerSenior Systems Engineer
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Hi Dr. Klahn,

What sort of credentials that I need to share with them to allow email routing on my Exchange Server ?

I've never heard that before.
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Senior IT System EngineerSenior Systems Engineer
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Thanks all,

It turns out that I need to whitelisted the IP address in the SPAM filter to allow this to happens.

Yes, I know the risk, at least with the white listing, I know which IP address can do the relay.

I have added THEIR SPF entry to my public DNS record. Hopefully this is correct action I am taking.
Senior IT System EngineerSenior Systems Engineer
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Thanks all.