-Message input format: C<eml>, C<maildir>, C<imap>, C<imaps>, C<nntp>,
-C<nntps>, C<mboxrd>, C<mboxcl2>, C<mboxcl>, or C<mboxo>.
+Message input format: C<eml>, C<mboxrd>, C<mboxcl2>, C<mboxcl>, or C<mboxo>
+when reading from stdin or using one of the mbox variants.