When trying to use the msend utility on Fedora 28 or higher, it says libnsl.so.1 => not found.
Looking at the libraries needed it seems libnsl.so.1 is not present:
libm.so.6 => /lib64/libm.so.6 (0x00007fdf2eb64000)
libnsl.so.1 => not found
libdl.so.2 => /lib64/libdl.so.2 (0x00007fdf2eb5e000)
libc.so.6 => /lib64/libc.so.6 (0x00007fdf2e998000)
Install libnsl onto Fedora 28 or higher, or alternatively try soft linking the libnsl2 library to libnsl as there should be backwards compatibility.
If the soft link does not work then install libnsl.