We do not currently have plain text emails within Event Espresso.
The CSS being shown within the emails usually happens when the emails are being marks as spam. Does it happen for all message types sent from the site?
If so we recommend using a transaction email service such as the ones listed here:
That removes your hosts mail server from the equation and generally resolves the problem.
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Support forum for Event Espresso 3 and Event Espresso 4.