Postman

Postman is a CLI utility for batch-sending email through any SMTP server (so you can use Postman with your personal Gmail, Amazon SES, Sendgrid, or anything else you'd like).

Features

• Fast, templated, bulk emails
• Reads template attributes from CSV
• Works with any SMTP server

Why this over cat | sed | sendmail < bcc distro_list?

• Supports both text and HTML parts in emails
• All of the power of templates in Go (conditionals, etc)
• Some SMTP providers will complain if there are too many emails in BCC (generally >1000)
• Sends emails concurrently

Installation

$ go get github.com/zachlatta/postman

Usage

$ postman [flags]

Example

$ postman -html template.html -text template.txt -csv recipients.csv \
    -sender "Zaphod Beeblebrox <zaphod@beeblebrox.com>" \
    -subject "Hello, World!" -server smtp.beeblebrox.com -port 587 \
    -user zaphod -password Betelgeuse123

template.html:

<h1>Hello, {{.Name}}! You are a {{.Type}}</h1>

template.txt:

Hello, {{.Name}}! You are a {{.Type}}.

recipients.csv:

Email,Name,Type
arthur@dent.com,Arthur Dent,Human
ford@prefect.com,Ford Prefect,Alien
martin@gpp.com,Martin,Robot
trillian@mcmillan.com,Trillian,Human

Please check out (and contribute to) the usage page on the wiki for more details.

License

tl;dr

The MIT License (MIT)

Copyright (c) 2014-2023 Zach Latta

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.