Solved
cq.mailer.DefaultMailService : RestAPI integration
Could I integrate an Rest full end-point in cq.mailer.DefaultMailService.
this is because, i don't have an SMTP server, but rather API end point to connect.
BrianKasingliAccepted solution
Adobe Champion and Community Advisor
February 1, 2021
Yes definitely, you can make java HttpRequest from OSGI services, sling servlet, sling models, etc...
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://api.my-site/mail"))
.POST(HttpRequest.BodyPublishers.ofString(requestBody))
.build();