How can I Change the Email attachment Limit in Dedicated Server ?

The possibility of such a spam origination could be in two locations

1. A remote attacker sends email with your user name and password
2. It originated from the system where this email id has been configured

We suggested the following;

1. Change the password of the email to a stronger one
2. Remove the email id
3. Secure the network which uses this email id

why this is happening ?

1. The passwords of emails might be weak that it makes easier for an attacker to crack the password and then send mails thro it.
2. The network which uses the email id is infected

The steps that has to be taken is

1. Changing the password of all cpanels, emails etc
2. Identifying any issues in the network and fixing it

Solution :

1. Login to the cpanel
2. Click on Email Accounts option under Mails
3. Select the corresponding change Quota option for which Email ID you want to increase the Quota.
4. Change the Quota value and Click on change Quota.