Codeigniter 4 sending email is very easy because of the new functionality, Now the Codeigniter 4 available to download from the official website we learn unable to send email using PHP SMTP Codeigniter.

They have introduced the services classes to use the Codeigniter 4 services like email; you just call the services in Codeigniter by using the below code.

How to send email in codeigniter using SMTP ? - phpcodingstuff.com