This issue annoys me, so I searched for a workaround which I found :)

In Icecat go to about:preferences -> General -> Applications (only a
header): Set mailto to `Use other` and set it to
`/run/current-system/profile/bin/icedove`.

$ grep mailto
/gnu/store/3zxx08qfl9q6d9s80p58521y9x3ni3p1-icedove-78.3.3/share/applications/icedove.desktop
MimeType=x-scheme-handler/mailto;

That seems correct. xdg-open mailto:f...@gnu.org works for me always, so
it really seems a Icecat/Firefox thing...



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