#147 Proper handling of utf-8 characters in reply-to headers #148
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This PR aims to resolve #147.
Most e-mail headers got proper character encoding handling with PR #132. Unfortunately that change missed that the reply-to header was not treated as an address but as a regular header. As a result it did not get the same kind of handling as the from, to, cc and bcc headers.
This PR extends the same functionality also to the Reply-To header. It also adds corresponding tests and updates the project github workflow to work with Go 1.16 even without a go.mod file