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<p dir="auto">On 25 Nov 2021, at 19:06, aisrael wrote:</p>
</div><div class="plaintext" style="white-space: normal;"><blockquote style="margin: 0 0 5px; padding-left: 5px; border-left: 2px solid #777777; color: #777777;"><p dir="auto">After several verifications, this seems to be be a weird issue : I attach a screenshot of a mail that displays that strange behaviour (image 1) : when you click on the link, nothing happens as the $ sign does not get included.</p>
<p dir="auto">I then checked the appearance in Mail, Outlook and the Webmail, and the $ is now included in the URL, which means you can click on it. Then I forwarded the dubious email as an attachment with Mailmate, and it is now shown correctly in the attachment.</p>
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<p dir="auto">This is likely because it was properly wrapped in HTML tags when forwarded. In that case, MailMate won't be involved in link detection. This only happens for plain text (or plain text segments in HTML). It's heuristic behavior in any email client and it should work better in the next update of MailMate.</p>
</div><div class="plaintext" style="white-space: normal;"><blockquote style="margin: 0 0 5px; padding-left: 5px; border-left: 2px solid #777777; color: #777777;"><p dir="auto">But to make things weirder (at least to me),I asked my correspondent whether his address includes a $, but it turns out his actual website address is <a href="https://www.normalesup.org/~adanchin" style="color: #777777;">https://www.normalesup.org/~adanchin</a>,
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Which for some reason ends up here as : <a href="https://urldefense.com/v3/__https://www.normalesup.org/*adanchin__;fg!!JFdNOqOXpB6UZW0!75VXTITbKIuEkUszAgRESBwDFxsBvVA_gpxn-KRscdeSmysMEwovF2Guj84utNpFQuBH" style="color: #777777;">https://urldefense.com/v3/__https://www.normalesup.org/*adanchin__;fg!!JFdNOqOXpB6UZW0!75VXTITbKIuEkUszAgRESBwDFxsBvVA_gpxn-KRscdeSmysMEwovF2Guj84utNpFQuBH</a>$ when I receive it.</p>
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<p dir="auto">Somewhere between you and your correspondent there's a filter which alters the content of your emails. Given the <code style="margin: 0; padding: 0 0.4em; border-radius: 3px; background-color: #F7F7F7;">urldefense</code> domain used, it appears that it's some kind of security issue which changes links such that if you click on them then you'll be redirected through a different server. This server can then block, e.g., any known phishing URLs.</p>
<p dir="auto">On the other hand, these rewrites could also be used to track when and where you follow links in emails (similar to image tracking techniques)...</p>
<p dir="auto">--<br>
Benny</p>
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