OK, so what shall we do? Shall we fix it on old SLE's or let it be since it is not security bug? Anyway, we are probably doing different tests. At my side meggy@irbis:~/(some-repo)> git format-patch -1 0001-(commit-msg).patch meggy@irbis:~/(some-repo)> git send-email 0001-(commit-msg).patch works fine on SLE15 and Tumbleweed (on Tumbleweed only occurs https://bugzilla.suse.com/show_bug.cgi?id=1098924, but the email is sent correctly). Am I doing something different from you? I will test it on VM with SLE12SP3 soon. The incorrect parsing of arguments could be some old unreported bug. I will take a look but I think this is not important right now.