Links don't work when in plain-text (characters encoding issue)

[3x5]

I recently had a client try to de-list his email from Microsoft's spam filter. When he received a verification email from Microsoft, the link didn't work. I investigated and found that the string in the link's URL had characters that were encoded. For instance, @ became %40, & became & and so on.

This made the verification link unusable. I sent a similar email to myself and opened it in the same account, in Roundcube and in Thunderbird. The encoding is correct in Thunderbird but not Roundcube.

Is there anything I can do to force plain-text emails to render properly in roundcube, when in plain-text mode?