Prerequisites

• Did you read the README?
• Are you running the latest version?
• Did you search other issues to see if this problem was already reported?

Description

I am hosting arc on our private server. This is the same machine self-hosting our email. Arc can notify it's user via email but expect SMTP configuration as follows:

            "smtp":{
                "address": "smtp.gmail.com",
                "port": 587,
                "username": "youremail@gmail.com",
                "password": "your smtp password"
            },

this is nice but on a server with a properly configured mail server, this is excessive and storing a password in clear text that should not be necessary.

The user running arc can send email by issuing commands like $ echo test | mail -s test user@domain.tld without providing any passwords and it would be very nice if arcd was able to do the same.

Environment

Please provide:

• Contents of the json configuration file you are using (remove the password hash before posting). - not related.
• Operating system and browser versions used as clients. - OpenBSD/amd64 6.2 browser is not relevant
• If possible, any javascript log on the browser developer console. - not relevant
• uname -a of the arcd server.

$ uname -a
OpenBSD tintagel.pl 6.2 GENERIC#5 amd64

• Debug output while reproducing the issue ( arcd --log-debug ... ). - not relevant.

Steps to Reproduce

1. Configure OpenSMTPD
2. Sacrifice a goat to MS & Google to have your mail delivered
3. Try to tell arc to use your existing setup

Expected behavior: What you expected to happen

I expect arcd to send email using the system available mail command.

Actual behavior: What actually happened

I have to set up smtp forcing arc to do a TCP/IP connection over TLS to localhost to send the same email instead of shelling out to mail.

♥ ANY INCOMPLETE REPORT WILL BE CLOSED RIGHT AWAY ♥