Thank you so much for your help. I really appreciate it!
In case anyone else wanders through with the same problem, the text relevant to this issue in my php.ini now reads:
[mail function]
; For Win32 only.
SMTP = localhost
smtp_port = 25
; For Win32 only.
sendmail_from = [email protected]
replacing “[email protected]” with my email address and “localhost” with the smtp information corresponding to this email address.