# How to update Theme Mail CSS?

**URL:** <https://forum.mautic.org/t/how-to-update-theme-mail-css/16599>\
**Category:** Product Support\
**Created:** [October 16, 2020, 2:09pm UTC](https://forum.mautic.org/t/how-to-update-theme-mail-css/16599 "2020-10-16T14:09:07Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![cremigerhonig](https://avatars.discourse-cdn.com/v4/letter/c/9de053/32.png) [@cremigerhonig](https://forum.mautic.org/u/cremigerhonig)\
**Post date:** [July 5, 2024, 10:15am UTC](https://forum.mautic.org/t/how-to-update-theme-mail-css/16599/2 "2024-07-05T10:15:14Z")

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my email CSS is making problems

is it related to this issue?

# [Not sending emails - adding various CSS to mails - sending email create 503 error](https://forum.mautic.org/t/not-sending-emails-adding-various-css-to-mails-sending-email-create-503-error/32651)

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