This article explains why the Zyxel two-factor authentication (2FA) email may not be delivered and outlines simple steps to ensure secure access to the myZyxel portal.
Possible Cause
Zyxel’s email system uses automated delivery protection mechanisms.
If a user’s email address (or other addresses within the same domain):
repeatedly marked Zyxel emails as Spam; or
experienced multiple delivery failures (bounce messages, full mailbox, invalid address),
the system automatically adds the email address to a block list.
As a result, 2FA emails are temporarily not delivered.
What This Means
This is a standard practice to protect the email server’s sending reputation and ensure reliable delivery to legitimate recipients. The block is not related to an account error.
Recommended Actions for the User
Check Spam / Junk / Quarantine folders and, if the email is found, mark it as Not Spam.
Add the Zyxel domain
@zyxel.comto the trusted or safe sender list.Ensure the mailbox is not full and the email address is entered correctly.
If using a corporate email account, contact the mail server administrator to review filtering rules and block lists.
If necessary, contact Zyxel Support to verify and remove the email address from the block list.
Important
Once the root cause (spam marking or delivery errors) is resolved, delivery of 2FA emails is usually restored automatically.
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