# Custom Headers in Emails

**URL:** <https://forum.mautic.org/t/custom-headers-in-emails/10801>\
**Category:** Product Support\
**Created:** [February 15, 2019, 12:15pm UTC](https://forum.mautic.org/t/custom-headers-in-emails/10801 "2019-02-15T12:15:18Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bob-herman](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/bob-herman/32/288_2.png) [@bob-herman](https://forum.mautic.org/u/bob-herman)\
**Post date:** [February 15, 2019, 12:15pm UTC](https://forum.mautic.org/t/custom-headers-in-emails/10801/1 "2019-02-15T12:15:18Z")

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Hi:

I’m trying to use the Custom Headers feature of emails (on the Advanced tab) like in the attached screenshot but when I check the header of a received email it’s not actually there. I’m using SendGrid API to send. Any ideas? Is this a bug?

Thanks!  
Bob H.

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**Author:** ![ayusopatricia](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/ayusopatricia/32/2587_2.png) [@ayusopatricia](https://forum.mautic.org/u/ayusopatricia)\
**Post date:** [May 13, 2020, 7:25pm UTC](https://forum.mautic.org/t/custom-headers-in-emails/10801/2 "2020-05-13T19:25:43Z")

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Any comments about this? Is there any documentation about Custom Headers? Especially with SendGrid.

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**Author:** ![carlos.machado](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/carlos.machado/32/1164_2.png) [@carlos.machado](https://forum.mautic.org/u/carlos.machado)\
**Post date:** [June 11, 2021, 1:43pm UTC](https://forum.mautic.org/t/custom-headers-in-emails/10801/3 "2021-06-11T13:43:28Z")

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I am getting the same problem. I need to use the sandbox from sendgrid, to testing the performance on mautic.

I have tried to put the header: mail\_settings: {sandbox\_mode: {enable: true}}

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**Author:** ![mahamcou](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/mahamcou/32/1595_2.png) [@mahamcou](https://forum.mautic.org/u/mahamcou)\
**Post date:** [February 25, 2023, 12:28pm UTC](https://forum.mautic.org/t/custom-headers-in-emails/10801/4 "2023-02-25T12:28:29Z")

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Email headers, when used properly, would enhance deliverability. As such, it would be great if Mautic developers, contributors, users, help by sharing best entries in custom headers.  
Moreover, somehow, the entire headers topic is missed out from the documentation.  
#ideas #support #general-discussion #development