• Mail Delivery Failure Messages

    Some e-mail providers will reject an e-mail if the file size exceeds their maximum file size, which could potentially be lower than the limit imposed by 1&1 IONOS. If so, you will receive a bounceback message from that e-mail provider informing you that the mail was not delivered because the attachment is too large.

  • Storage Space of My Mail Basic Account

    Please see a list of packages and their storage limits.

    List of Packages

  • Upgrade My E-mail Accounts to Be Unlimited

    Find out what options are available for you to change to a new package that will include unlimited e-mail accounts.

    Switch Package

  • I didn't find the answer to my question

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