Difference between POP and IMAP settings
POP - an internet standard for retrieving email. POP stands for "Post Office Protocol." May also be referred to as "incoming mail."
POP is a one-way communication path. This means that when you access your email from your computer or other local device, your email client (such as Outlook or Thunderbird) will save a local copy of the email to your computer, then delete the original from the mail server. Email accessed using POP ties it to a specific computer or device, thus you will be unable to view your webmail from multiple sources. However, POP is useful for storing local copies of email to be read offline or when not connected to the internet, as well as for ensuring that your webmail mailbox in MailCentral will retain plenty of storage room for accepting more email in the future.
IMAP - an internet standard for retrieving email. IMAP stands for "Internet Message Access Protocol." May also be referred to as "incoming mail."
IMAP is a two-way communication path. This means that when you access your email from your computer or other local device, any changes that are made will be synchronized with your webmail on the mail server. For example, if you log in to MailCentral, create a new folder in your webmail, then put a message into that folder, this change will instantly and automatically appear in your email client (such as Outlook or Thunderbird), and on your mobile device. Also, if you are at work and you begin a message then save it, it will still be there in your mailbox when you log in from a different email client, such as one on your home computer.
IMAP provides a better method to access your mail from multiple devices, say from work, home, and your mobile, through two-way syncing capabilities between your mail clients and the Hosting Support mailbox. However, because IMAP saves all your messages on the server, be sure frequently clean up your mailbox, deleting old messages and saving the ones you want to keep to a local computer.