这是一个很好的邮件群发的程序，除了模板替换，我想我还需要加上频率控制，我不想刚发几封邮件就被block，特别是在国内的邮件运营条件下。

增加的功能包括:

• 频率控制

./postman
Postman is a utility for sending batch emails.

Usage:

  postman [flags]

Flags:

  -attach      attach a list of comma separated files
  -c           number of concurrent requests to have
  -csv         path to csv of contact list
  -debug       print emails to stdout instead of sending
  -fmin        number of requests in x minutes, x value 【频率时间间隔】
  -freq        number of requests in x minutes 【频率时间间隔内请求次数】
  -html        html template path
  -password    smtp password
  -port        port of smtp server
  -sender      email to send from
  -server      url of smtp server
  -subject     subject of email
  -text        text template path
  -user        smtp username

$ go get github.com/liujianping/postman
$ cd $GOHOME/src/github.com/liujianping 
$ go install
$ $GOHOME/bin/postman

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

• 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

$ go get github.com/zachlatta/postman

$ postman [flags]

$ 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.

tl;dr

The MIT License (MIT)

Copyright (c) 2014 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.