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Symantec Email Security.cloud Notification What is this ?

Posted 14th Feb 2021
I sent a email to a ceramic company earlier regarding jugs and have now recieved a email from alert@notification.messagelabs.com
"The Symantec Email Security.cloud service has detected a file attachment in an email sent by you that may be unacceptable, according to your organization’s policy, or the intended recipient’s policy."

I haven't got Synantec installed, but the email its referring to is a actual email I sent. I thought this maybe something built into windows or I may have some sort of web based antivirus installed with Talktalk. Im not aware of having either...Any ideas what this is ?
The email isnt actually asking me to do anything.
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