Function to send emails using Oracle Cloud Infrastructure Email Delivery

Function to send emails with Oracle Cloud Infrastructure Email Delivery. It just uses the plain old SMTP package in Go

Pre-requisites

Configure OCI Email Delivery

• Generate SMTP Credentials for a User - you'll have to configure these user credentials in the app (OCI_EMAIL_DELIVERY_USER_OCID and OCI_EMAIL_DELIVERY_USER_PASSWORD variables)
• Add approved sender - use OCI_EMAIL_DELIVERY_APPROVED_SENDER parameter to configure this in the app
• Note down value for the SMTP server - it'll be used in the OCI_EMAIL_DELIVERY_SMTP_SERVER configuration attribute

Clone this repo

Switch to correct context

• fn use context <your context name>
• Check using fn ls apps

Create app

fn create app --annotation oracle.com/oci/subnetIds=<SUBNETS> --config OCI_EMAIL_DELIVERY_USER_OCID=<OCI_EMAIL_DELIVERY_USER_OCID> --config OCI_EMAIL_DELIVERY_USER_PASSWORD=<OCI_EMAIL_DELIVERY_USER_PASSWORD> --config REGION=<REGION> --config OCI_EMAIL_DELIVERY_SMTP_SERVER=<OCI_EMAIL_DELIVERY_SMTP_SERVER> --config OCI_EMAIL_DELIVERY_APPROVED_SENDER=<OCI_EMAIL_DELIVERY_APPROVED_SENDER> fn-email-app

e.g.

fn create app --annotation oracle.com/oci/subnetIds='["ocid1.subnet.oc1.phx.aaaaaaaaghmsma7mpqhqdhbgnby25u2zo4wqlrrcskvu7jg56dryxt3hgvkz"]' --config OCI_EMAIL_DELIVERY_USER_OCID=ocid1.user.oc1..aaaaaaaa4seqx6jeyma46ldy4cbuv42q4l26scz5p4rkz3rauuoioo42qwmq@ocid1.tenancy.oc1..aaaaaaaaydrjm77otncda2xn7qtv7l3hqnd3zxn2u6siwdhniibwfv4wwhta.3n.com --config OCI_EMAIL_DELIVERY_USER_PASSWORD='s3cr3t:-)' --config OCI_EMAIL_DELIVERY_SMTP_SERVER=smtp.us-phoenix-1.oraclecloud.com --config OCI_EMAIL_DELIVERY_APPROVED_SENDER=test@test.com fn-email-app

Check

fn inspect app fn-email-app

Moving on...

Deploy the app...

cd fn-email-app and fn -v deploy --app fn-email-app

Test it out

change the email contents as per your requirements (don't forget to provide a valid email address)

echo -n '{"To": "test@gmail.com", "Subject": "Hello from Fn", "Body": "Have fun with Fn at fnproject.io"}' | fn invoke fn-email-app sendemail

If all goes well, you should see the email (don't forget to check your spam folder) and a response from the function - Sent email successfully!