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I am getting this message when sending out group emails. 550 spam, or I note that a similar message

I am getting this message when sending out group emails through Outlook 365.

550 spam, or phishing or malware.  Please check or edit your message and try sending it again. (6-1-3-2) ID (66944180031E2DEE)

It started sometime after the 6th Aug 2024, the last day I was able to send out similar group emails without any errors.

The message from the System Administrator is against each of the addresses.

Norton is not flagging any issues re spam or phishing or malware!

I note that a similar error was reported in 2021

JanLegg

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