Title: Invalid mailbox syntax
Last modified: October 31, 2019

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# Invalid mailbox syntax

 *  Resolved [yxda](https://wordpress.org/support/users/yxda/)
 * (@yxda)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/invalid-mailbox-syntax-5/)
 * From one day to another I keep receiving syntax errors in Contact Form7., even
   though I think I entered things correctly. Can someone help? Below, you can see
   my settings:
    In the Form section I use: <label> Email (*) [email* visitor-email]
   </label> In Mail section I am getting error messages. In Additional Headers I
   wrote: Reply-to: [visitor-email] Error message: Invalid mailbox syntax is used
   in the Reply-to field.
 * In Mail (2) To field I wrote:
    [visitor-email] Error message received: Invalid
   mailbox syntax is used
 * I tried many options, such as using [visitor-name] <[visitor-email]> or using[
   email* visitor-email] instead, but nothing worked.
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Finvalid-mailbox-syntax-5%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Author [Takayuki Miyoshi](https://wordpress.org/support/users/takayukister/)
 * (@takayukister)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/invalid-mailbox-syntax-5/#post-12086237)
 * See [How to Resolve Configuration Errors](https://contactform7.com/configuration-errors/)
 *  Thread Starter [yxda](https://wordpress.org/support/users/yxda/)
 * (@yxda)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/invalid-mailbox-syntax-5/#post-12087267)
 * Thank you. I tried again everything, even changed visitor-email to visitorn-email,
   in case visitor-email is taken by wordpress, but peoblem is still not resolved.
   If anyone else can see where the problem might be, I would appreciate your help.
   It might something that slips my attention.
 *  Thread Starter [yxda](https://wordpress.org/support/users/yxda/)
 * (@yxda)
 * [6 years, 8 months ago](https://wordpress.org/support/topic/invalid-mailbox-syntax-5/#post-12137289)
 * Can anyone recommend a contact form instead of Contact Form 7? It seems that 
   Contact Form 7 just does not work and there is no support from the plugin developer.
   Any suggestions would be appreciated.

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Invalid mailbox syntax’ is closed to new replies.

 * ![](https://ps.w.org/contact-form-7/assets/icon.svg?rev=2339255)
 * [Contact Form 7](https://wordpress.org/plugins/contact-form-7/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/contact-form-7/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/contact-form-7/)
 * [Active Topics](https://wordpress.org/support/plugin/contact-form-7/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/contact-form-7/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/contact-form-7/reviews/)

 * 3 replies
 * 1 participant
 * Last reply from: [yxda](https://wordpress.org/support/users/yxda/)
 * Last activity: [6 years, 8 months ago](https://wordpress.org/support/topic/invalid-mailbox-syntax-5/#post-12137289)
 * Status: resolved