Arduino code problem

i have an arduino code that connects to ESP32 wifi and if no connection available switch connection mode to AP mode then user enter [login to view URL] using internet browser from the device that connects to the device using AP mode to open the wifi configuration html page allowing the user to enter his/her wifi credentials to be saved and used by ESP , once done ESP will restart and switch back to wifi station mode and uses the saved credentials to connect , once connection established it should sends email using GMAIL with some details .. the issues i need help with : 1- once the device reaches the part where it should sends email it crashes 2- I need the wifi configuration page to be opened once user connects to the device AP automatically 3- the ESP code has another part where it communicates with another MCU Arduino mega using serial communication .. the communication works fine but when asking to display the received messages from Ardiono to ESP serial monitor sometimes the messages received and sometimes not however these messages whether received on the serial monitor or not they are sent via email all are sent not the ones that are displayed on ESP serial monitor only thanks in advance