Red exclamation mark in emails.

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1

Hi all,
I was just testing email from 2 of my servers,
I noticed a red exclamation mark on one of my emails (Just beside the sender name). Can anyone explain what it is about. the screenshot is given in the following link.

1080×266 88.4 KB

Thanks

2

The sender may not be verified that means have issues with SPF/DKIM records,

If you’re sending from a server that server IP must be included in the SPF record