Hello,
Avast is detecting I-Frames in e-mail messages and told me that it possible an danger issue is, what are I-Frames and can the harm mine pc and must i deleted those messages,
IFrames have to do with HTML code.
Have a look HERE
For specific info on how frames and the ifram element is used look HERE
It is as said “potentially” dangerous.
Depending on which email-program you use, i-frames can be used to execute arbitrary code. Doesn’t mean every i-frame has to be dangerous, but it carries a risk in it. An i-frame-exploit is an exploit contained within a body of HTML and is typically used in email. The exploit allows malicious code to be executed by reading or previewing files containing this code. This exploit deceives the HTML viewer into executing viral code that the viewer thinks is an Audio or a Video component of the body of HTML.
Depending on what email-program you use, the mailprogram uses microsofts viewer (usually internet-explorer) to view the i-frame. This is a security risk which I personally would NOT take.
Only if you use an absolutely safe mail-program like iScribe with its own safe viewer, you might consider taking the risk, but if I were you, I’d delete it.
Exercise a high degree of common sence and you will be safe. Don’t start out viewing an email in preview view (especially OE).
Who sent the email is your biggest clue, iframes within email are extremely infrequent in personal email with very few legitimate reasons for their use. Combine that with an unknown or obscure origin of the email and alarm bells should be ringing in your head as well as avast.