Knowledge Base

Limiting Outgoing Mail

Your hosting provider can impose limitations on the number of outgoing
email messages per hour, usually in order to restrict possible spam. A
subscription, domain, and mailbox have their own limits. By default,
values for the limits are defined by the hosting provider.

You might want to increase the limits to send more email messages, or
decrease the limits to prevent excessive outgoing mail.

The number of outgoing email messages sent from a parent object (such as
a subscription) is counted as the sum of email messages from its child
objects (such as domains). And limits work accordingly:

The sum of messages from all domains of a subscription cannot be
greater than the subscription’s limit.
The sum of messages from all mailboxes of a domain cannot be greater
than the domain’s limit.

Note: The limit of a parent object is more important than individual limits
of child objects. For example, if the limit for a subscription is
reached, no domains of this subscription can send mail, even when
some of the domains have not yet reached their individual limit.
Similarly, if the limit for a domain is reached, no mailboxes of this
domain can send mail, regardless of the fact that some of the
mailboxes have not reached their individual limit.

Note: The options described below are displayed only if the limitations on
outgoing mail are switched on by your hosting provider. Also, some
limits might be unavailable (for example, the limit on the number of
outgoing email messages from a mailbox), depending on the mail server
used in Plesk.

To set up limits on the number of outgoing email messages for a
domain:

Go to Mail > the Mail Settings tab and select one or more
domains for which you want to change the limit, by using checkboxes.
Click Limit Outgoing Messages on the toolbar.
Edit the Limit on outgoing messages field.

To set up limits on the number of outgoing email messages for a
mailbox:

Go to Websites & Domains > Mail Settings of the domain where
the mailbox belongs > the Email Addresses tab and select one or
more email addresses for which you want to change the limit, by using
checkboxes.
Click Limit Outgoing Messages on the toolbar.
Edit the Limit on outgoing messages field.

Alternatively, you can click the email address and edit The maximum
number of outgoing email messages.