Bounces:

hard bounce
A hard bounce is an e-mail message that has been returned to the sender because the recipient's address is invalid. A hard bounce might occur because the domain name doesn't exist or because the recipient is unknown. When the recipient's name is known, e-mail may be rejected because the sender's mail box is full or for other reasons.

soft bounce
A soft bounce is an e-mail message that gets as far as the recipient's mail server but is bounced back undelivered before it gets to the intended recipient. A soft bounce might occur because the recipient's inbox is full. A soft bounce message may be deliverable at another time or may be forwarded manually by the network administrator in charge of redirecting mail on the recipient's domain.

DNS Failure
The inability of a DNS server to convert a domain name to an IP address in a TCP/IP network. A DNS failure may occur within a company's private network or within the Internet.

For more information on Bounce Mail Management click here

How is Nounc Different/Why should I switch from my current email marketer to Nounc?
Nounc offers a personal, fully customizable email marketing service that caters to each individual client’s needs. We offer stock and custom templates for our clients to choose from. Nounc is designed with you in mind, if you don’t have time to constantly update and send out your weekly or monthly marketing material, then you don’t have to! You can sign up for our Simplex service, where Nounc Technicians will email your newsletter to your client list for you.