mailrender - Use the API to render emails as images or PDF

Quick start

1. run mailrender server

docker run --rm -ti --shm-size=500m -p 8000:8000 restsend/mailrender

2. Render a .eml file:

curl -o output.png -X POST 'http://localhost:8000/mailrender?format=png&device=web' \
    -F "content=@example.eml"

API

Submit the data request in the way of POST, parameters through urlquery:

1. Parameters of url query：
   • format output format: png and pdf
   • device Dimensions of the device page:
     • web Laptop screen size: 1440 x 900 high-resolution monitor
     • iphone iPhone Display: 736 x 414 Retina Display
   • timezone Show when the email was sent: Default is America/New York
   • waitload The seconds to wait for the page to load, the default is 60 seconds
   • headless Only render email content, default is false
   • textonly Only render text, if there is html will not render, the default is false
   • author Author information of picture or PDF
   • watermark Show watermark on image
   • viewport Viewport (x, y, width, height) for capturing screenshot, such as: 0,0,600,800
   • scale Scale Page scale factor, default is 1
   • hidpi Render with hidpi screen, pixelratio*2, default is false
2. Parameters for form-data：
   • content file type, required

How mailrender work?

1. Parse the eml file, unpack the attachment and embed files, to ensure that the mail can be displayed normally
2. Render the email content through chrome-headless to get the image/pdf.

Deploy Docker service

If Docker runs mailrender, you need to add --shm-size=500m to the run parameter of docker, for example:

docker run --rm -ti --shm-size=500m -p 8000:8000 restsend/mailrender

The following environment variables can be adjusted:

• PORT HTTP server port ,default: 8000
• SIZELIMIT Upload file size limit(MB), default: 50
• AUTHOR Author info, default: https://github.com/restsend/mailrender
• STORE temporary storage directory, default: /tmp/mailrender

docker run --rm -ti --shm-size=500m -e PORT=8080 -p 8080:8080 restsend/mailrender

Add or change font

We have built-in noto fonts, if you need to modify the fonts, add fonts in fonts/, and modify conf/local.conf to configure different font matching

How to build

There are two ways to compile mailrender:

1. docker build .
2. go mod download && go build .