In order to make the best use of the Email Delivery service, it is important to know the meaning and context of the names used within the platform. Below is a list of the main ones.


The customer is the one who buys the service from Qboxmail, offers the service to his users and customers by integrating it into their applications and pays the invoices. Each customer may purchase the SMTP service several times to use it for different purposes and projects (with limits), even assigning it to different users and customers or to the same user and customer for different uses.


Following the purchase of the service by a customer, an account consisting of user name and password is activated. Each account is associated with a sending plan with respective limits and a type of sending (transactional or promotional email). An account belongs to only one customer. Several authorised sending domains are associated with each account. The reputation of the service is linked to the account, so that each customer can have different and distinct reputations, linked to that specific activity, and so that the reputations of the same or different users do not influence each other.


The domain name that has been added to the system to be authorised to send emails with that domain as sender. In order to be used for sending messages, domains must be linked to an account. One domain can be linked to several accounts. Each domain has its own DKIM signature.

Sending Pool

Group of IP addresses from which messages belonging to a specific account and a specific message category (transactional, promotional) are sent. The sending pool is assigned per account automatically by the Email Delivery service based on the outcome of message sending (number of bounces, unsubscriptions, user interaction with received messages).

DKIM Signature

Each message sent has two DKIM signatures, one from the sending platform and one from the domain, so each domain has its own dedicated DKIM signature. The combination of these two signatures makes it possible to optimise the deliverability of the message to the main email providers.

Customer Reputation

Each customer has its own reputation, which is calculated on the basis of the average reputation of its accounts. Customer reputation does not have a direct impact on the deliverability of sent messages, but is used by Qboxmail to assign the customer a reliability score necessary to determine the eligibility of, for example, high-volume plans.

Account Reputation

Each account has its own reputation, which depends on certain factors that are constantly updated over time. The first is the bounce rate in relation to the total number of messages sent, other factors influencing reputation are unsubscriptions or user interaction with messages received. Another very important factor in determining an account's reputation is any complaints that may be received from recipients of messages received by their accounts. Reputation is calculated per account automatically by the Email Delivery service based on the above-mentioned factors.

Accepted messages

All messages accepted by the send queue of our SMTP, regardless of the outcome of the send.

Enqueued messages

All messages still in the send queue because they have just been sent or because the remote server is not responding or is rejecting the message with a temporary error.

Bounced messages

Messages that were not accepted by the remote MX, or that came back with a 500-type error after sending, even after some time.

Delivered messages

All messages successfully accepted by the MX server from remote recipients.

Suppressed messages

Messages whose recipients are on the suppression list and for which, therefore, no sending attempt is made, but are directly discarded.

Available email messages

For accounts with a monthly subscription, the available messages are the number of messages that can still be sent from the current time until the end of the billing period.
For accounts with a prepaid package, these are the messages that can still be sent before the expiry date of the purchased package.

Suppression list

The email addresses that make up the suppression list are all email addresses that have generated a bounce or have reported communications received as spam.
When a customer is about to send a campaign, the suppression list intervenes and goes to suppress the sending to all those contacts who should no longer receive communications and who may still be on one or more lists. Messages sent to addresses on the suppression list are therefore not counted among the mailings made by the account.

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