Enabling SendMail() in MT5

[AnkaSoftware]

I have setup Email correctly in MT5 through Tools->Options->Email and ticked the checkbox Enable. Test button in this window works fine.

However from my EA/Indicator when I use SendMail() function, emails are not sent and GetLastError() returns error - 4014 - "System function is not allowed to call". Any other setting to be done in the terminal which I have missed?

[AnkaSoftware]

Further problem isolation reveals  that SendMail() function fails if calculated from OnCalculate() function. Indicator code to reproduce the problem enclosed.

//+------------------------------------------------------------------+
//|                                                 SendMailTest.mq5 |
//|                        Copyright 2011, MetaQuotes Software Corp. |
//|                                              http://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2011, MetaQuotes Software Corp."
#property link      "http://www.mql5.com"
#property version   "1.00"

#property indicator_chart_window
#property indicator_buffers 1
#property indicator_plots   1
#property indicator_label1 "UP !MOVE"
#property indicator_type1 DRAW_LINE
#property indicator_color1 clrRed

double Down1[];
int OnInit()
  {
//---
   // Initialize the indicators
   SetIndexBuffer(0, Down1, INDICATOR_DATA);
   ArraySetAsSeries(Down1, true);
   PlotIndexSetDouble(0, PLOT_EMPTY_VALUE, EMPTY_VALUE);
   
   string concatString1 = "Working Test";
   string concatString2 = "Working Test";
   SendMail(concatString1, concatString2);
   
//   TestFunc();
//---
   return(0);
}

int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime& time[],
                const double& open[],
                const double& high[],
                const double& low[],
                const double& close[],
                const long& tick_volume[],
                const long& volume[],
                const int& spread[]) {
                
   string concatString1 = "Not Working Test";
   string concatString2 = "Not Working Test";
   SendMail(concatString1, concatString2);
   Print("Error ", GetLastError());
   
   return(rates_total);
}

[Andriy Moraru]

Perhaps the reason is that you are trying to send mail too fast? There might be some required delay period before SendMail() can work again.

[Rashid Umarov]

Please try again in current build. It has been changed.