Since I set my main Zoho account I've been forwarding all my e-mail to a GMail account. Since yesterday, 21st of November, my forwarded e-mail hasn't reached the GMail account. I've tried disabling and enabling again the forwarded account, and setting again another GMail account (the new GMail account receives the verification code just fine) for forwarded e-mail to no avail.

I've even checked the DKIM and SPF records for my domain and can't find any problem there. So long, the only thing that fails is the forwarded e-mail.