Hello SAP Community!

We were trying to use the "sap-cf-mailer" library , we tried an example and it worked fine.
Link: Example that we've used.
Everything was pretty good until we've found that On-Premise SMTP servers are not supported by this library (yet).
We noticed it because CAP error log throwed this message:

Now , our question is . Is there any workaround , way , or a blog that explains how to send emails from CAP via consuming an OnPremise SAP BTP Destination?
Best regards, Rodrigo
PD:
Below is our code that we use in our CAP App:
Package.json
{
"name": "smtp_",
"version": "1.0.0",
"description": "A simple CAP project.",
"repository": "<Add your repository here>",
"license": "UNLICENSED",
"private": true,
"dependencies": {
"@sap/cds": "^5",
"express": "^4",
"hdb": "^0.18.3",
"sap-cf-mailer": "^0.0.5"
},
"devDependencies": {
"sqlite3": "^5.0.2"
},
"scripts": {
"start": "cds run"
},
"eslintConfig": {
"extends": "eslint:recommended",
"env": {
"es2020": true,
"node": true,
"jest": true,
"mocha": true
},
"globals": {
"SELECT": true,
"INSERT": true,
"UPDATE": true,
"DELETE": true,
"CREATE": true,
"DROP": true,
"CDL": true,
"CQL": true,
"CXL": true,
"cds": true
},
"rules": {
"no-console": "off",
"require-atomic-updates": "off"
}
},
"cds": {
"requires": {
"db": {
"kind": "sql"
}
},
"hana": {
"deploy-format": "hdbtable"
}
}
}
MTA.yaml
## Generated mta.yaml based on template version 0.4.0
## appName = smtp_
## language=nodejs; multitenant=false
## approuter=
_schema-version: '3.1'
ID: smtp_
version: 1.0.0
description: "A simple CAP project."
parameters:
enable-parallel-deployments: true
build-parameters:
before-all:
- builder: custom
commands:
- npm ci
- npx -p @sap/cds-dk cds build --production
modules:
# --------------------- SERVER MODULE ------------------------
- name: smtp_-srv
# ------------------------------------------------------------
type: nodejs
path: gen/srv
parameters:
buildpack: nodejs_buildpack
build-parameters:
builder: npm-ci
memory: 512M
disk-quota: 1024M
requires:
# Resources extracted from CAP configuration
- name: smtp_-db
- name: demo_connectivity
- name: demo-destination
- name: demo-uaa
provides:
- name: srv-api # required by consumers of CAP services (e.g. approuter)
properties:
srv-url: ${default-url}
# -------------------- SIDECAR MODULE ------------------------
- name: smtp_-db-deployer
# ------------------------------------------------------------
type: hdb
path: gen/db
parameters:
buildpack: nodejs_buildpack
requires:
# 'hana' and 'xsuaa' resources extracted from CAP configuration
- name: smtp_-db
- name: demo-uaa
resources:
# services extracted from CAP configuration
# 'service-plan' can be configured via 'cds.requires.<name>.vcap.plan'
# ------------------------------------------------------------
- name: smtp_-db
# ------------------------------------------------------------
type: com.sap.xs.hdi-container
parameters:
service: hana # or 'hanatrial' on trial landscapes
service-plan: hdi-shared
properties:
hdi-service-name: ${service-name}
- name: demo-uaa
type: org.cloudfoundry.existing-service
parameters:
service: xsuaa
service-plan: application
- name: demo-destination
parameters:
service-plan: lite
service: destination
type: org.cloudfoundry.existing-service
- name: demo_connectivity
type: org.cloudfoundry.existing-service
SERVICE.JS
const cds = require("@sap/cds");
const SapCfMailer = require('sap-cf-mailer').default;
const transporter = new SapCfMailer("SMTP");
module.exports = cds.service.impl(async (srv) => {
srv.on("sendmail", async (req) => {
// use sendmail as you should use it in nodemailer
const result = await transporter.sendMail({
to: 'some@mail.com',
subject: `This is the mail subject`,
text: `body of the email`
});
return JSON.stringify(result);
});
});
SERVICE.cds
service smtp {
action sendmail() returns String;
}