The phrase "further to the below email" is correct and usable in written English. You can use it to refer to an email that you had already sent to a recipient or when following up a previous email. For example, "Further to the below email, I wanted to discuss the next steps of the project."
The new store must sell representative examples of British haute cuisine (suggested list on application to the email below).
Please note that all referees must send their letters of recommendation directly to the email below.
Answers to the email address below.
Further details will be sent to the ITAC email list.
The draft tool was attached to the email, with space below the statements for comments and suggestions.
Further, participants are called by phone if there is no reply to the reminder email.
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Following the breach, the council attempted to recall the email to prevent further disclosure.
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Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK