If users received emails for Microsoft Outlook, there are two common types of IMAP and POP protocols.
Hosting Speed 建議用戶以IMAP接收郵件。原因如下:
Hosting Speed recommends users to use IMAP protocol for receiving emails. The reasons are as follows:
IMAP優勢 The Advantage of IMAP：
1. 開啟信箱時，只是下載信頭（message headers）部分而已，故不會佔用PC端的硬碟空間。
When open the mailbox, it only downloads the message headers, so these wouldn't occupy the hard disk space of PC Port.
It can connect from several different locations, and the viewed emails are still in the same mailbox on the server.
3. 不必一直收信，信箱會自動更新。當網路速度受限時，performance 會較POP server好，因為只是下載信頭部分而已。
As mailbox would automatically update, it doesn't need to receive emails every time. When the internet speed is limited, the IMAP performance is better than POP because it only downloads the message headers.
It is convenient to manage emails by folders.
POP缺點 The disadvantage of POP：
After opened mailbox, all emails usually would be downloaded to PC, which occupied the hard disk space on the PC. Also, the server doesn't keep the email backup because the emails avoid to be accumulated, and avoid the server mailbox from getting full. Thus, users need to decide whether emails save to the server or not.
When connected from the different locations, the mailboxes aren't able to be synchronized at each location. For example, email appears on the PC (A) but this email doesn't appear on the PC (B). Therefore, to achieve the synchronization when connected, emails are repeatedly downloaded, so emails appeared repeatedly.
Since mailbox wouldn't be updated automatically, all emails must be received manually. When the internet speed is limited, the POP performance is poor.
When connected to the different of location, it can't read all the folders, and this management is poor.