SMTP vs FTP settings
SMTP settings are usually different from the login details for your FTP account. We hope the following guide would help:
FTP vs SMTP:
A FTP account is used to publish files to your website.
SMTP settings are needed when you need to send emails. For example, when a new mail account needs to be set up on the Mail app, you will be asked for your SMTP settings.
The most common port number for FTP is port 21. The most common port number for a standard SMTP server is port 25. (Both port numbers are industry-standard, but web hosts have full control of port number selections and may choose to use a different port)