When receiving suspicious mails via ESA some links redirect to the secure web sandbox from cisco... e.g.:
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WARNING: Your email security system has determined the message below may be a potential threat.
It may pose as a legitimate company, tricking victims into revealing personal information.
If you do not know the sender or cannot verify the integrity of the message, please do not respond or click on links in the message. Depending on the security settings, clickable URLs may have been modified to provide additional security.
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