To Split Email by delimiter in axapta you can try below code     #define.EmailDelimiter(",")      List      list;      str       _emailIdList;      container    sendList;      ListIterator  iterator;      boolean     valid;      ;      _emailIdList = "test@gmail.com,test1@gmail.com,test2@gmail.com,test3@gmail.com,test4@gmail.com";      valid = true;      list = new List(Types::String);      list = Global::strSplit(_emailIdList, #EmailDelimiter);      iterator = new ListIterator(list);      while(iterator.more())      {        info(strfmt("%1",iterator.value()));        sendList += iterator.value();        iterator.next();      }     Strsplit used to split the email list you can try and special character to check it.  
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