Add log entries for invalid email settings
Add log entries for invalid email settings

Send mail function adds log entries if any email is invalid, and returns
true or false, depending on success.

josthkko/ggrc-core,kr41/ggrc-core,vladan-m/ggrc-core,hasanalom/ggrc-core,VinnieJohns/ggrc-core,AleksNeStu/ggrc-core,VinnieJohns/ggrc-core,vladan-m/ggrc-core,NejcZupec/ggrc-core,prasannav7/ggrc-core,jmakov/ggrc-core,hyperNURb/ggrc-core,AleksNeStu/ggrc-core,selahssea/ggrc-core,hasanalom/ggrc-core,AleksNeStu/ggrc-core,j0gurt/ggrc-core,hasanalom/ggrc-core,andrei-karalionak/ggrc-core,hyperNURb/ggrc-core,edofic/ggrc-core,uskudnik/ggrc-core,uskudnik/ggrc-core,prasannav7/ggrc-core,andrei-karalionak/ggrc-core,jmakov/ggrc-core,plamut/ggrc-core,hasanalom/ggrc-core,edofic/ggrc-core,kr41/ggrc-core,plamut/ggrc-core,j0gurt/ggrc-core,j0gurt/ggrc-core,prasannav7/ggrc-core,AleksNeStu/ggrc-core,NejcZupec/ggrc-core,selahssea/ggrc-core,hyperNURb/ggrc-core,edofic/ggrc-core,jmakov/ggrc-core,josthkko/ggrc-core,selahssea/ggrc-core,jmakov/ggrc-core,edofic/ggrc-core,hasanalom/ggrc-core,VinnieJohns/ggrc-core,uskudnik/ggrc-core,andrei-karalionak/ggrc-core,NejcZupec/ggrc-core,prasannav7/ggrc-core,kr41/ggrc-core,hyperNURb/ggrc-core,NejcZupec/ggrc-core,josthkko/ggrc-core,j0gurt/ggrc-core,uskudnik/ggrc-core,vladan-m/ggrc-core,kr41/ggrc-core,jmakov/ggrc-core,vladan-m/ggrc-core,josthkko/ggrc-core,andrei-karalionak/ggrc-core,VinnieJohns/ggrc-core,plamut/ggrc-core,selahssea/ggrc-core,uskudnik/ggrc-core,plamut/ggrc-core,vladan-m/ggrc-core,hyperNURb/ggrc-core