When using the "Share by Email" feature on the OPAC (envelope icon), the mailto: link generates a message body that includes the bibliographic detail page URL. This works correctly on desktop email clients, but fails on mobile devices when the default mail app is Gmail. Instead of including the full URL, the email body is truncated after opac-detail.pl, and the biblionumber query parameter is missing (e.g., the URL stops at opac-detail.pl instead of opac-detail.pl?biblionumber=123456). This appears to be due to improper URL encoding of the mailto: body parameter, which causes mobile email apps to misinterpret query strings as part of the mailto: itself.