jamiechong

A lot of registration spam comes from emails with a subdomain. Spammers control a domain such as buymyjunk.com and then attempt to register on your site with emails such as irenemwd@foster2.buymyjunk.com and jakemgm@foster7.buymyjunk.com. This plugin simply blocks all registrations using a subdomain.
Reputable users will have a normal email address from a reasonable domain like @gmail.com, @mylegitbusiness.com, @outlook.com, @myschool.edu, etc.
There is no configuration and no setup. It simply just works. The plugin logs all blocked registrations so you can find potential false-positives. Find a link to this log file on the Plugins page where you activate/deactivate this plugin.

Ban Subdomain Emails

Prevent people from registering with emails that contain a subdomain to help reduce spam.

Paolo Melchiorre

Add a contact form to any post or page by inserting <code>[contact-form]</code> in the post. Messages will be sent to the post’s author or any email address you choose.
Or add a contact form to a text widget. Messages will be sent to the email address set in your Settings -> General admin panel or any email address you choose.
Your email address is never shown, and the sender never learns it (unless you reply to the email).
As seen on WordPress.com.
This plugin was imported from <a href="https://wordpress.org/extend/plugins/grunion-contact-form/" title="Grunion Contact Form - wordpress.org" rel="ugc">Grunion Contact Form</a> but it adds full internationalization using localized string from WordPress core.
An e-mail <a href="http://en.wikipedia.org/wiki/Signature_block" title="Signature block - Wikipedia" rel="nofollow ugc">signature block</a> was appended to the end of the e-mail message containing the sender’s name, email address, website and IP and delimited from the body of the message by a single line consisting of exactly two hyphens, followed by a space, followed by the end of line (“– \n”). This <a href="http://tools.ietf.org/html/rfc3676#section-4.3" title="Usenet Signature Convention - RFC3676 - IETF" rel="nofollow ugc">signature cut line</a> allows software to automatically mark or remove the sig block.
<h4>Configuration</h4>
The <code>[contact-form]</code> shortcode has the following parameters:
<ul>
<li>
<code>to</code>: A comma separated list of email addresses to which the messages will be sent. 
If you leave this blank: contact forms in posts and pages will send messages to the post or page’s author; and 
contact forms in text widgets will send messages to the email address set in Settings -> General.
Example: <code>[contact-form to="you@me.com"]</code>
Example: <code>[contact-form to="you@me.com,me@you.com,us@them.com"]</code>
</li>
<li>
<code>subject</code>: The e-mail subject of the message defaults to <code>[{Blog Title}] {Sidebar}</code> for text widgets 
and <code>[{Blog Title}] {Post Title}</code> for posts and pages. Set your own default with the subject option.
Example: <code>[contact-form subject="My Contact Form"]</code>
</li>
<li>
<code>show_subject</code>: You can allow the user to edit the subject by showing a new field on the form. The 
field will be populated with the default subject or the subject you have set with the previous option.
Example: <code>[contact-form subject="My Contact Form" show_subject="yes"]</code>
</li>
</ul>
<h3>License</h3>
<h4>Send E-mail</h4>
Copyright (C) 2011 Paolo Melchiorre
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see <a href="http://www.gnu.org/licenses/" title="Licenses - GNU Projec" rel="nofollow ugc">Licenses – GNU Project</a>.
<h3>Donation</h3>
This plugin is free for everyone! Since it’s released under the GPL License, you can use it free of charge on your personal or commercial blog. But if you enjoy this plugin, you can thank me and leave a <a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=10617157" title="Donate with PayPal" rel="nofollow ugc">small donation</a> for the time I’ve spent writing and supporting this plugin.

Send E-mail

Add a contact form to any post, page or text widget. Messages will be sent to any email address you choose. As seen on wordpress.com with added i18n.

Ban Subdomain Emails vs Send E-mail