Some incoming mail, particularly embeded graphics, contains several vertical blue lines on left of document

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Kar Lee

Vertical blue lines on left side of some e-mails I receive (never in plain text)

Guruprasad Ra

Diane Poremsky

Senior Member
Outlook version
Outlook 2016 32 bit
Email Account
Office 365 Exchange

This blue line: is how HTML messages quote when you have the option enabled to "prefix each line".

ETA: if you are receiving the message with the lines, its how the sender has Outlookconfigured for quoting. (I think Mail/OE/LM also add the line.)

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