Why is the SMTP feature not working?

Our plugins comes with the possibility to use an external SMTP server to send email the final customer.


"Product sending failed SMTP Error: Could not connect to SMTP host. There were problems sending email"

Unfortunately, in fight against SPAM emails, some Internet Service Providers require their subscriber to send mail through the ISP's own SMTP servers.
If you experience problems sending email, please contact your ISP to determine if it requires different SMTP server settings.