Block Temporary Email


This plugin will verify every email address submitted by users.
It’ll automatically detect and block disposable, temporary email addresses.
It’ll give a nice warning message when users are signing up, logging in,
or changing email to a temporary email.

The plugin checks the domain name using a service named
If a domain name is blocked, it will be stored into a local blacklist.
You can also manage your own local whitelist and blacklist to allow or
disallow certain domains.

The plugin integrates with the WordPress built-in function is_email().
It works seamlessly with other plugins including WooCommerce,
Contact Form 7, Gravity Form, Jetpack/Grunion contact forms, Kadence Blocks Forms as well as
other formbuilders and ecommerce plugins and WordPress’ own registration form.


  • Disposable email address blocked during sign up
  • Temporary email address blocked when updating profile
  • Settings to manage your own blacklist and whitelist


Sign up and get your API token at IsTempMail.

Upload the plugin to your blog, then click Activate it under Plugins > Installed Plugins.
Then enter the API token at your WordPress Dashboard > Settings > IsTempMail.


Do you send my user email addresses to other servers?

No, we don’t. The plugin will only send the domain part of email address to validate.

Is the plugin free?

Yes, the plugin is free to use. IsTempMail also offers a free plan that will be sufficient
for most blogs. You will be notified when you use more credits than included in the free plan.

What happens if the service is down?

A downtime is very unlikely, the IsTempMail service has outstanding availability of 99.99%
over the last 6 months.
But the plugin was developed to be stable in the unlikely event of a temporary downtime. It
will continue to work, validating emails using your local blacklist and whitelist. Your users
will be able to sign up, log in and comment on your blog just fine.

What happens to existing users with fake email address

Existing users registered with fake email addresses won’t be able to log in to your blog when
the plugin is activated. Be prepared for users contacting you regarding this topic. Usually
people who used a disposable email address won’t come back to your website though.


སྤྱི་ཟླ་དང་པ། 26, 2023 1 reply
I tried all kinds of methods… 3 plugins… Edit wp-config.php and I even asked Chat GPT to give me a snippet but the solution was this incredible plugin, which worked perfectly with WOO, tks a lot!
སྤྱི་ཟླ་ལྔ་པ། 10, 2022 2 replies
This plugin is outstanding, it does exactly what I expected. I also had a problem and the support was very fast and efficient. Highly recommended.
སྤྱི་ཟླ་ལྔ་པ། 21, 2021
offers of disposal emails grow faster than the plugin can keep up with. From the first three disposables offered by google, one was blocked. A BIG FAIL
སྤྱི་ཟླ་དང་པ། 7, 2021
The plugin works like charm, I tested it with different temp domains and it blocked all of em. Recommended!
སྤྱི་ཟླ་གཉིས་པ། 4, 2019
Seem there is only this type of plugin in WP repository, I am looking for this plugin for a long time. Thanks so much
སྤྱི་ཟླ་བདུན་པ། 21, 2018 1 reply
I actually thought it’s not going to work properly with CF7. But I was wrong. Working perfectly.
Read all 8 reviews

Contributors & Developers

“Block Temporary Email” is open source software. The following people have contributed to this plugin.




Tested with WordPress 6.6


Tested with WordPress 6.4.3


Improve support for forms and advanced forms built with Kadence Blocks


Add support for advanced forms built with Kadence Blocks


Add support for forms built with Kadence Blocks
Tested with WordPress 6.4.2


Tested with WordPress 6.4.1


Tested with WordPress 6.3.2


Tested with WordPress 6.3.1


Fix a bug during plugin uninstallation
Add option to disable validating logins (premium)


Tested with WordPress 6.2


Tested with WordPress 6.1.1
Updated a typo and readme


You can now disable email checking on a certain POST payload e.g. add
_xoo_el_form=login to stop checking email on login popup.


  • Update API request format.
  • Separate IsTempMail blacklist and your own local blacklist.


In prior versions, it’ll check all emails passed to is_email() function.
You can now change the hook behavior to check only emails submitted via browsers (POST/GET values).


If a domain name has no MX record and doesn’t resolve to any IP address, it will be marked as “unresolvable”
and the email will be considered as invalid. It helps in preventing some typos like gmail.con or gmail.comm.


Add local blacklist and whitelist.


First version