This is what I found in the log file:
I hope this helps. Thank you.
2019-07-19 10:13:09.769 ===== TRACE ===== NEW CONNECTED USER '*******' (using remember me feature)
2019-07-19 10:17:48.869 ***** ERROR ***** [V8.0.2] Error sending mail
2019-07-19 10:17:48.873 ***** ERROR ***** [V8.0.2] SMTP Server : smtp.******.de
2019-07-19 10:17:48.875 ***** ERROR ***** [V8.0.2] SMTP Port : ***
2019-07-19 10:17:48.877 ***** ERROR ***** [V8.0.2] Mail stored in Database : #512
2019-07-19 10:17:48.880 ***** ERROR ***** [V8.0.2] PHPMail error : SMTP connect() failed.
github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
2019-07-19 10:17:48.883 ***** ERROR ***** [V8.0.2] PHPMail debug :
2019-07-19 10:17:54.310 ***** ERROR ***** [V8.0.2] Error sending mail
2019-07-19 10:17:54.313 ***** ERROR ***** [V8.0.2] SMTP Server : smtp.******.de
2019-07-19 10:17:54.316 ***** ERROR ***** [V8.0.2] SMTP Port : ***
2019-07-19 10:17:54.318 ***** ERROR ***** [V8.0.2] Mail stored in Database : #513
2019-07-19 10:17:54.321 ***** ERROR ***** [V8.0.2] PHPMail error : SMTP connect() failed.
github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
2019-07-19 10:17:54.323 ***** ERROR ***** [V8.0.2] PHPMail debug :
2019-07-19 10:48:34.337 ===== TRACE ===== NEW CONNECTED USER '*******'
2019-07-19 10:48:35.457 ***** ERROR ***** [V8.0.2] ERROR *****
2019-07-19 10:48:35.467 ***** ERROR ***** [V8.0.2] on file 'D:\xampp\htdocs\projeqtor\tool\projeqtor.php' at line (3701)
2019-07-19 10:48:35.470 ***** ERROR ***** [V8.0.2] cause = file_get_contents(): php_network_getaddresses: getaddrinfo failed: No such host is known.
2019-07-19 10:48:35.472 ===== TRACE ===== Cannot check Version at
projeqtor.org/admin/getVersion.php
2019-07-19 10:48:35.475 ===== TRACE ===== Maybe allow_url_fopen is Off in php.ini...
2019-07-19 10:50:56.230 ***** ERROR ***** [V8.0.2] Error sending mail
2019-07-19 10:50:56.234 ***** ERROR ***** [V8.0.2] SMTP Server : smtp.******.de
2019-07-19 10:50:56.236 ***** ERROR ***** [V8.0.2] SMTP Port : ***
2019-07-19 10:50:56.239 ***** ERROR ***** [V8.0.2] Mail stored in Database : #514
2019-07-19 10:50:56.254 ***** ERROR ***** [V8.0.2] PHPMail error : SMTP connect() failed.
github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
2019-07-19 10:50:56.257 ***** ERROR ***** [V8.0.2] PHPMail debug :
2019-07-19 10:54:09.267 ***** ERROR ***** [V8.0.2] Error sending mail
2019-07-19 10:54:09.270 ***** ERROR ***** [V8.0.2] SMTP Server : smtp.******.de
2019-07-19 10:54:09.281 ***** ERROR ***** [V8.0.2] SMTP Port : ***
2019-07-19 10:54:09.284 ***** ERROR ***** [V8.0.2] Mail stored in Database : #515
2019-07-19 10:54:09.286 ***** ERROR ***** [V8.0.2] PHPMail error : SMTP connect() failed.
github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
2019-07-19 10:54:09.289 ***** ERROR ***** [V8.0.2] PHPMail debug :