Don't get signal when I open multiple terminals

 

Hello, 

I have a few terminals open on my laptop with i7 8 generation and 16 gb ram. The terminals are all logged in in the same trade account. There are indicators running on the chart that send emails to my outlook. The problem is that only 1 terminal can send this these emails. When I have indicators running on the other accounts I get the message in the journal Mail: 'Signal on 1-2-3 Indicator' failed. When I do the test message in these other terminal they are just working fine. It looks that they other terminal block the signal for the other terminals... 


Does anybody now how I can fix this problem?