I’ve tested this further by adding a second form to my site with a single mail configuration. The message is sent fine when there is no file attachment, but fails to send when there is a file attachment. As stated in my previous post I have tried both relative and absolute URLs.
When I attempt to use absolute URL for the file attachment as either:
https://www.farmerdirect.com.au/wp-content/uploads/2017/09/TEST.pdf
or
/wp-content/uploads/2017/09/TEST.pdf
I get the config error “Attachment file does not exist” appearing beneath the File Attachments textarea
When I attempt to use the absolute URL:
/home/farmerdd8fuued/public_html/wp-content/uploads/2017/09/TEST.pdf
or I use the relative URL:
uploads/2017/09/TEST.pdf
the File Attachments textarea validates but the message is not sent upon submitting the form.