Send a one-off email to a provided recipient list.

• Golang 1.18

From the project root...

Create env file:

cp data/.env.example data/.env

Amend env values so that they reflect the following:

• MAILGUN_API_KEY = API key registered within Mailgun
• MAILGUN_SENDER_DOMAIN = Sender domain configured within Mailgun
• SENDER_NAME = Sender's name to issue the email from
• SENDER_EMAIL = Sender's email address to issue the email from
• REPLY_TO_NAME = Name to include with Reply-To when issuing email
• REPLY_TO_EMAIL = Email address to include as Reply-To when issuing email
• BCC_NAME = Name to include with BCC when issuing email
• BCC_EMAIL = Email address to include as BCC when issuing email
• EMAIL_SUBJECT = Subject to use when sending emails️
• MESSAGE_SIGN_OFF = Sign-off name within email message

Create message templates:

cp data/templates/example.message.html data/templates/message.html
cp data/templates/example.message.txt data/templates/message.txt

Change the template names of each new file respectively:

data/templates/message.html

-{{define "example_message_html"}}
+{{define "message_html"}}

data/templates/message.txt

-{{define "example_message_txt"}}
+{{define "message_txt"}}

Create recipients file:

cp data/recipients.example.yml data/recipients.yml

Amend new recipients file, ensuring that contents are valid YAML and retain the same .name and .email format per recipient.

From the project root...

go run main.go

...then visit the following pages in your web browser to preview the templates:

• http://localhost:8080/html
• http://localhost:8080/txt

From the project root...

go run main.go -send