Why so? It shouldn’t be this way by default.
I tried to link “[[gnus:nnml:lists.gnu.emacs-orgmode#87in1rkqlk....@gmail.com][Email from Tim Cross: Re: {O} Ox-html: Replace <b> with <strong> and <i> with <em>]]” and after org-store-link in appropriated buffer, org-insert-link gave me “Email from Tim Cross: Re: {O} Ox-html: Replace <b> w”.