- Hard bounce
- An email which has been returned to the sender and is permanently undeliverable. This could be due to a number of reasons including a non-existent or changed address.
- This is the area at the top on an email/page, containing specific content. Examples of what is built into the header include the sender and recipient addresses, the subject line and the date.
- HTML based Email
- HTML is an abbreviation for Hypertext Mark up Language. This is an email code that is written so that special fonts, graphics, background colours and logos can be included in emails.