or app-admin/eselect-sendmail if you prefer. This request is about the possibility of choosing /usr/bin/sendmail realization using eselect. At the moment all realizations of /usr/bin/sendmail (mail transfer agents, see the full list of them in virtual/mta-1.ebuild) just blocks each other. And it is not possible to set-up exim while postfix is running. I believe it will be much more convinient to have them installed at the same time with /usr/bin/sendmail-exim and /usr/bin/sendmail-postfix binaries and /usr/bin/sendmail symbolic link, managable throgh eselect.