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
It works seamlessly with other plugins including WooCommerce,
Contact Form 7, Gravity Form, Jetpack/Grunion contact forms, as well as
other formbuilders and ecommerce plugins and WordPress’ own registration form.
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 emails 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.
Contributors & Developers
“Block Temporary Email” is open source software. The following people have contributed to this plugin.Contributors
Translate “Block Temporary Email” into your language.
Interested in development?
Browse the code, check out the SVN repository, or subscribe to the development log by RSS.
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
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.