aws-letter-sender

Email sender using AWS SES with HTML/text templates support.

Quick Send

1. Create .env from example.env
2. Create your template in templates folder
3. Prepare data.csv:

EMAIL
user1@example.com
user2@example.com

4. Run:

go run ./cmd/quick/main.go --data-file="data.csv" --email-sender="sender@email.com" --subject="Subject" --tmpl-file="templates/example.html"

Advanced Usage

Running Without Flags

You can run program without any flags

go run ./cmd/quick/main.go

Required params will be taken from data.csv and .env files.

Tip

Program supports flag -h

go run ./cmd/quick/main.go -h  # Show all available options

Log results

Program logs all email sending attempts to .history.log.

Data File

Data file (which is .csv) that defines email settings and template variables.

Read about .csv file

Advanced data.csv example:

EMAIL,TEMPLATE_FILE,SUBJECT,name
example@example.com,templates/example.html,My Example subject,Dias1c
example@example.com,templates/example.txt,Text letter,MyName
example@example.com,,,

Explaining variable keys:

key	variable	description
EMAIL	system	variable, recipient email
TEMPLATE_FILE	system	variable, path to template file
SUBJECT	system	variable, letter subject
name	user	variable

Note

For the last row with empty columns, the values ​​for those columns will be taken from the program arguments or env file.

System data Variables

System reserved variables are named with capital letters. Each system variable has its own function.

key	type	function
EMAIL	required	recipient email
TEMPLATE_FILE	optional	path to template file
SUBJECT	optional	letter subject
SENDER_EMAIL	optional	aws sender email
SENDER_REGION	optional	aws region

All optional variable values ​​are taken from the arguments passed to the program or from the .env file.

Variables that are not system keys will be used as variables for templates.

Parameters Priority

Program uses priority system to resolve conflicts when same parameter is set in multiple places:

Priority	Source	Example
High	Data file	data.csv: SUBJECT=Welcome
Medium	Command flags	--subject="Hello" as flag on launch
Low	.env file	SUBJECT=Hi in .env

Templates

HTML

<h1>Welcome {{.name}}!</h1>
<p>Your activation code {{.code}} for {{.EMAIL}}</p>

Text

--- {{.EMAIL}}
Dear {{.name}},
Your order #{{.orderId}} completed