Gmail 'send as' email issue with SMTP

Gmail 'send as' email issue with SMTP

Hi there,

I have set up a a new Zoho account and users for our domain, and I am trying to integrate the Zoho accounts into our existing Gmail accounts.

Receiving email through POP3 works fine, however I am having difficulty setting up so I can send emails from the Zoho account using Gmail. 

I followed instructions and am trying to use the 'send email as' feature on Gmail but I am getting the following error message, before being able to enter any server and port info:

/You must send emails through axxxxxxxxxt.org.uk SMTP servers when you send as xxxxx@ xxxxx  However, this functionality is not available for your account. Please contact your domain administrator for more information.

I have enabled IMAP on the Zoho settings.

Please can you advise, thank you.

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