The plugin sometimes successfully send a pdf as email attachment, but also sometimes it fails send the pdf. I got this error message below when fails:
” Network Error (tcp_error)
A communication error occurred: “Operation timed out”
The Web Server may be down, too busy, or experiencing other problems preventing it from responding to requests. You may wish to try again at a later time.
For assistance, contact your network support team. ”
Can you please suggest me a solution. I am using VPS of Vultr with 512 MB, 1 core, for testing the sending form.