Custom email field in query string of URL


I have a custom field 'ReferrerEmail' in which we're capturing email addresses.
We want to create links in the autoresponder email like so:[ReferrerEmail]

When this link is clicked in the autoresponder email which contains them, the @ sign is stripped and we're left with  '' instead of ''.

Can we somehow URL encode this custom field?
Does the standard email field have the same limitations?

Thanks in advance.

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