I needed a way to send email from a Ponzu installation
running on all kinds of systems without shelling out. sendmail or postfix et
al are not standard on all systems, and I didn't want to force users to add API
keys from a third-party just to send something like an account recovery email.
Usage:
$ go get github.com/nilslice/email
package main
import (
"fmt"
"github.com/nilslice/email"
)
func main() {
msg := email.Message{
To: "[email protected]", // do not add < > or name in quotes
From: "[email protected]", // do not add < > or name in quotes
Subject: "A simple email",
Body: "Plain text email body. HTML not yet supported, but send a PR!",
}
err := msg.Send()
if err != nil {
fmt.Println(err)
}
}Under the hood
email looks at a Message's To field, splits the string on the @ symbol and
issues an MX lookup to find the mail exchange server(s). Then it iterates over
all the possibilities in combination with commonly used SMTP ports for non-SSL
clients: 25, 2525, & 587
It stops once it has an active client connected to a mail server and sends the initial information, the message, and then closes the connection.
Currently, this doesn't support any additional headers or To field formatting
(the recipient's email must be the only string To takes). Although these would
be fairly strightforward to implement, I don't need them yet.. so feel free to
contribute anything you find useful.
Warning
Be cautious of how often you run this locally or in testing, as it's quite likely your IP will be blocked/blacklisted if it is not already.