Mail list - Maillist
An automated system that allows people to send email to one address where the message is then copied and sent to all of the other subscribers to the maillist. A common maillist is Listserv. Often abused and used to send spam, or unsolicited email.

Mail-From
One of the authentication schemes used by InterNIC. In the mail-from scheme, the email address that is used to send a modification request is compared to the email addresses that are on file for the individuals or organizations who are listed as authorized points of contact/agent for the domain name, the contact, or the host. The mail-from option under the Guardian] plan allows the contact to specify two email addresses, rather than just one, which can help avoid problems with authentication later if one of the email addresses should change.

Megabyte
1024 kilobytes or one million bytes equals a megabyte.

Merchant Account
An account set up by a bank which allows a business to accept credit cards and deposits collected funds into the business checking account. Merchant providers assume a risk by allowing other businesses to accept credit cards under their name, and rely on those businesses to deliver the products or services to the customer as agreed.

Miva Merchant
Commonly used merchant account software used to allow hosting clients to accept credit cards on their sites. Ecommerce hosts often come with Miva Merchant ready to go.

Modify
Modify is a function where contact information or DNS information can be updated to reflect new changes pertaining to a domain name. Administrative and Technical Contacts have the ability to modify domain name information.