Add webhook support

Mailbox

Versatile email infrastructure that operates on AWS.

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go install github.com/harryzcy/mailbox-cli

For details, refer to mailbox-cli

Clone the repository.

git clone https://github.com/harryzcy/mailbox

Install serverless.
```
npm install -g serverless
```
Create an IAM user.

Create an IAM user with AdministratorAccess and export the access key as environment variables.
```
export AWS_ACCESS_KEY_ID=<your-key-here>
export AWS_SECRET_ACCESS_KEY=<your-secret-key-here>
```
In production, setup the IAM user following this guide from serverless.
Setup AWS services.

Manually create S3 buckets, and setup SES and SQS (optional) from AWS console.
Copy over example configurations and fill in correct fields.
```
cp serverless.yml.example serverless.yml
```
Under provider.environment section, modify REGION, S3_BUCKET, SQS_QUEUE (optional, only if SQS should be enabled).
Deploy the app.
```
make deploy
```
Configure email receiving.

From AWS console -> Configuration -> Email receiving -> Create rule set -> Create rule, add two actions:
1. Deliver to Amazon S3 bucket, then enter your bucket name.
2. Invoke AWS Lambda function, and select mailbox-dev-emailReceive or mailbox-prod-emailReceive.
Deploy mailbox-browser or use mailbox-cli.

It runs on AWS services, including SES, Lambda, API Gateway, DynamoDB, and SQS.

Note that only the two most recent minor versions of Go are officially supported.

	iam:
	role:
	statements:
	- Effect: Allow
	Action:
	- dynamodb:GetItem
	- dynamodb:PutItem
	- dynamodb:UpdateItem
	- dynamodb:DeleteItem
	- dynamodb:BatchGetItem
	- dynamodb:BatchWriteItem
	Resource: "arn:aws:dynamodb:${self:provider.region}:*:table/${self:provider.environment.DYNAMODB_TABLE}"
	- Effect: Allow
	Action:
	- dynamodb:Query
	- dynamodb:Scan
	Resource: "arn:aws:dynamodb:${self:provider.region}:*:table/${self:provider.environment.DYNAMODB_TABLE}/index/${self:provider.environment.DYNAMODB_TIME_INDEX}"
	- Effect: Allow
	Action:
	- dynamodb:Query
	- dynamodb:Scan
	Resource: "arn:aws:dynamodb:${self:provider.region}:*:table/${self:provider.environment.DYNAMODB_TABLE}/index/${self:provider.environment.DYNAMODB_ORIGINAL_INDEX}"
	- Effect: Allow
	Action:
	- s3:GetObject
	- s3:DeleteObject
	Resource: "arn:aws:s3:::${self:provider.environment.S3_BUCKET}/"
	- Effect: Allow
	Action:
	- sqs:GetQueueUrl
	- sqs:SendMessage
	Resource: "arn:aws:sqs:${self:provider.region}:*:${self:provider.environment.SQS_QUEUE}"
	- Effect: Allow
	Action:
	- ses:SendEmail
	- ses:SendRawEmail
	Resource: "arn:aws:ses:${self:provider.region}::identity/"