Title: Multiple additional headers returning error
Last modified: November 15, 2021

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# Multiple additional headers returning error

 *  [angeloarlotta](https://wordpress.org/support/users/angeloarlotta/)
 * (@angeloarlotta)
 * [4 years, 6 months ago](https://wordpress.org/support/topic/multiple-additional-headers-returning-error/)
 * Hi,
    I’m trying to add multiple CC in the autoresponder email that will be inserted
   from user typing different addresses in the frontend form fields.
 * So I’m adding this code to the “Additional headers” field into “Mail (2)” options:
 * Cc: [emailcliente2]
    Cc: [emailcliente3]
 * [https://ibb.co/4wkqDww](https://ibb.co/4wkqDww)
 * It triggers and correctly send the autoresponder emails but I get these two errors
   as shown in the screenshot:
    Invalid mailbox syntax is used in the Cc field. 
   Invalid mailbox syntax is used in the Cc field.
 * It happens also if I add a Bcc instead. How can I solve? It is safe to keep this
   error active?
 * Thanks to anyone can help!

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [Takayuki Miyoshi](https://wordpress.org/support/users/takayukister/)
 * (@takayukister)
 * [4 years, 6 months ago](https://wordpress.org/support/topic/multiple-additional-headers-returning-error/#post-15071823)
 * See [How to resolve configuration errors](https://contactform7.com/configuration-errors/)
 *  Thread Starter [angeloarlotta](https://wordpress.org/support/users/angeloarlotta/)
 * (@angeloarlotta)
 * [4 years, 6 months ago](https://wordpress.org/support/topic/multiple-additional-headers-returning-error/#post-15072442)
 * Thank you [@takayukister](https://wordpress.org/support/users/takayukister/) ,
   I understood! Only one email field was required, so if I turn all the email fields
   as required the error disappears but, the origin of the request is to give the
   possibility to insert extra optional Cc: so how can I have only the main email
   field required and the other email fields not required and not showing this error?
 * Thanks.
    Angelo

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Multiple additional headers returning error’ is closed to new replies.

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## Tags

 * [errors](https://wordpress.org/support/topic-tag/errors/)

 * 2 replies
 * 2 participants
 * Last reply from: [angeloarlotta](https://wordpress.org/support/users/angeloarlotta/)
 * Last activity: [4 years, 6 months ago](https://wordpress.org/support/topic/multiple-additional-headers-returning-error/#post-15072442)
 * Status: not resolved