On top of having the custom register added to the interface (register's LClass defined for a specific module in Startup).. interface languages matter as well.
Make sure to add the custom register also under:
SetLangMode(LangEnglish,"ENG",0);
Is it somehow possible to support such kind of address row in external email outgoing from SERP?
Sometimes we want to redirect the reply from recipient for particular e-mail address different from se...