How was IMAP developed

POP, SMTP & IMAP - what exactly is behind it?

What is smtp

SMTP is the abbreviation for "Simple Mail Transfer Protocol" and does what its name suggests: it simply serves to send and forward e-mails. So while POP3 and IMAP work on the recipient side of the e-mail traffic, SMTP takes over the sending and forwarding of messages on the sender side.

How secure are POP, IMAP and SMTP?

SMTP and POP3 are pure text protocols. This means that the e-mail password and user name are transmitted in plain text before a secure connection is established. That is a high security risk. IMAP, on the other hand, has a function that enables the server to transmit authentication data only when a secure connection is guaranteed. Even in this case, the text content of the e-mail will still be transmitted in clear text. Only the SSL security certificate offers sufficient protection for your e-mail traffic. It encrypts both the text content and the supplied authentication data.


The POP3, IMAP and SMTP e-mail protocols ensure that you can send, receive and store e-mails. SMTP works as the sender protocol and enables you to send e-mails to the recipient via your mail server. There they are queried by POP3 and transmitted directly to the recipient's end device. As an extended query and transmission protocol, IMAP also offers you the option of permanently storing your e-mails on your mail server and thus being able to access them at any time and from multiple devices. However, since all three e-mail protocols are text-based, additional protection is advisable. With the SSL security certificate you ensure that your e-mails are always transmitted in encrypted form.