# Inbox storage {#inbox-storage}


Storage belongs to each inbox. Adding another inbox does not increase the space
available to your existing inboxes.


## Check or add storage {#check-or-add-storage}


Open **Inbox → Manage inboxes**, select the address and open **Storage**. You can
also open storage options beside the usage summary in the inbox view.

The screen shows the selected inbox, its current usage and allowance, and any
available upgrade. The standard paid upgrade is **10 GB total storage for
US$5 per inbox per month**. It is not an extra 10 GB on top of the existing
allowance, and it does not apply to every inbox in the account.

Choose **Continue to checkout** to review and complete payment. Until payment is
confirmed, the existing allowance stays in place. If confirmation is delayed,
choose **Check payment status** rather than starting another purchase.

Availability depends on your billing provider; the screen shows your account's
actual offer. No purchase starts automatically when storage runs low.


## When an inbox is full {#when-an-inbox-is-full}


Nitrosend shows a warning as the inbox approaches its limit. New messages that
do not fit cannot be saved; messages already stored remain available. Add space
or remove messages you no longer need before the inbox fills up.

The inbox view also shows the applicable message-retention policy. Check that
policy separately from the storage allowance.


## Cancel or resume renewal {#cancel-or-resume-renewal}


Use **Storage** on the same inbox to cancel renewal. The upgrade remains
available until the paid term ends. Existing messages are not deleted because
you cancel, but the lower allowance can prevent new mail from fitting.

The same screen lets you resume renewal, complete an unpaid checkout or review
a payment issue. Cancelling an unpaid checkout does not change the current
allowance.

See [inbox setup](https://docs.nitrosend.com/guides/agent-inbox.md) or [email copies with Coexist](https://docs.nitrosend.com/guides/inbox-coexist.md).