You didn’t format your posted code as required in the Welcome Topic and on the topic instructions, that you cleared when posting this… I have fixed your post (twice). Please follow the directions in the future. Thank you.
As for your issue, we are not code mechanics here, we try to assist with learning about Blynk. And on that note, you shouldn’t have all that code in your void loop() when running Blynk. Use timed functions instead.
The void loop() runs thousands of times a second and you are probably flooding something when initiating an email and causing either a Blynk server disconnection or system block due to too many emails.
See Avoiding the void in this document…