Add note about security audit to addy.io (#2297)

Signed-off-by: Daniel Gray <[email protected]>
Signed-off-by: Freddy <[email protected]>

docs/email.md

@@ -319,7 +319,7 @@ Using an aliasing service requires trusting both your email provider and your al
         - [:simple-firefoxbrowser: Firefox](https://addons.mozilla.org/firefox/addon/addy_io/)
         - [:simple-googlechrome: Chrome](https://chrome.google.com/webstore/detail/addyio-anonymous-email-fo/iadbdpnoknmbdeolbapdackdcogdmjpe)
 
-The number of shared aliases (which end in a shared domain like @addy.io) that you can create is limited to 10 on addy.io's free plan, 50 on their $1/month plan and unlimited on the $4/month plan (billed $3 for a year). You can create unlimited standard aliases (which end in a domain like @[username].addy.io or a custom domain on paid plans), however, as previously mentioned, this can be detrimental to privacy because people can trivially tie your standard aliases together based on the domain name alone. They are useful where a shared domain might be blocked by a service.
+The number of shared aliases (which end in a shared domain like @addy.io) that you can create is limited to 10 on addy.io's free plan, 50 on their $1/month plan and unlimited on the $4/month plan (billed $3 for a year). You can create unlimited standard aliases (which end in a domain like @[username].addy.io or a custom domain on paid plans), however, as previously mentioned, this can be detrimental to privacy because people can trivially tie your standard aliases together based on the domain name alone. They are useful where a shared domain might be blocked by a service. Securitum [audited](https://addy.io/blog/addy-io-passes-independent-security-audit/) addy.io in September 2023 and no significant vulnerabilities [were identified](https://addy.io/addy-io-security-audit.pdf).
 
 Notable free features: