Office 365 Outlook getting rejected by some servers

[WSWSG]

I’ve been on Outlook for a while.  Yesterday, I tried to contact “jungle disk” and one other company.  Both of those emails were greater with this error message.  JUST TO MAKE CLEAR THE PROBLEM STARTED 24 HOURS AGO.

Jungle Disk suggest setting Outlook to Check for new email before sending.  I spend some time poking around Outllook but couldn’t find that in email account settings.

Did I mention I’ve been able to contact these folks before yesterday.
Bill xxxxx

Jan 25, 2021, 10:25 AM CST

My error. I am having this problem with this account as well. At least I can get an answer from you.

Here is the error message. It happens when I send on this one address. The error message indicates that is being rejected by JD.

Your message did not reach some or all of the intended recipients.

Subject: Test

Sent: 1/25/2021 10:22 AM

The following recipient(s) cannot be reached:

Jungle Disk Support (support@jungledisk.com) on 1/25/2021 10:22 AM

Server error: ‘550 5.7.1 <support@jungledisk.com>… Relaying denied: You must check for new mail before sending mail. [97.99.5.163]’

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[geekdom]

Search revealed this information:
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-7-1-in-exchange-online

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[Paul T]

WSWSG wrote:

Relaying denied:

That is likely to be a configuration problem caused by your recipient at jungledisk and has nothing to do with you. Ring them up and ask if they are having email issues.

cheers, Paul

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