Comment on Roundcube Webmail: SVG feImage bypasses image blocking to track email opensparentComments−SahAssar7moI'm pretty sure the original RFC (RFC 821) does not include remote resources and it was written far before HTML or HTTP was invented.It was text delivered over SMTP.
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I'm pretty sure the original RFC (RFC 821) does not include remote resources and it was written far before HTML or HTTP was invented.
It was text delivered over SMTP.