![]() If you want to set up IONOS Mail in a different desktop client, you can easily configure SMTP authentication manually as well. IONOS email plans that use IONOS Webmail come with SMTP AUTH already activated. For example, there are resources about setting up POP and IMAP, both of which include information on SMTP authentication. Under Settings, you can find links to various guides. In both instances, you’ll be directed to setup instructions, where you can also find relevant information about the outgoing mail server (SMTP), including SMTP authentication.Here you can click on the Learn more link under either POP download or IMAP access.Switch to the Forwarding and POP/IMAP tab.Click on Settings und select See all settings.When you connect your Gmail address to a desktop client, you can also activate SMTP authentication: You can access and change your cookie settings here. To display this video, third-party cookies are required. Below, you’ll find instructions on how to set up SMTP authentication for Gmail, Outlook and IONOS Mail. If, for some reason, it isn’t working, you may have to do it manually. In most mail programs, SMTP authentication is configured automatically when a new account is created. The server confirms the authentication, and the transmission of the email begins in accordance with SMTP. The client answers with the password in the Base64 code (in this example, it is “Iamnotaspammer”). The server asks for the password of the sender in Base64 code. The client answers in Base64 code with “John Doe”. The server uses the Base64 code for “Username:” to ask for the sender’s username. The client selects the authentication mechanism LOGIN. The server confirms the login, checks if it supports ESMTP (if it does not, it will continue with HELO thanks to the SMTP backward capability), and then offers the client a selection of authentication mechanisms. The SMTP client logs on with its computer name and queries the ESMTP support via the EHLO command. Other mechanisms include: GSSAPI, DIGEST-MD5, MD5, OAUTH10A, OAUTHEBEARER, SCRAM-SHA-1, and NTLM.Īn example of an SMTP authentication via LOGIN: PartyĪfter the connection has been established, the SMTP server answers.Instead, the server provides the client with a randomly generated computational task that can only be solved with the help of the password. Via this mechanism, the password is not transferred in code or plain text. CRAM-MD5: An alternative to PLAINand LOGINwith a higher level of security that follows the challenge-response principle.LOGIN: This works similarly to PLAIN, but the Base64 character set for the username and password are transferred in two steps rather than just one.Both are transmitted unencrypted and then encoded in the Base64 character set. PLAIN: An authentication via the username and password of the client.The protocol contains a selection of authentication mechanisms with different levels of security, which, depending on its configuration, an SMTP server can use in order to check the trustworthiness of an SMTP client. How does ASMTP work? ¶Īn essential feature of ASMTP is that emails are accepted via TCP port 587 (the SMTP AUTH port) and not over the traditional port 25/TCP. This is why nearly all mail servers now use ESMTP together with ASMTP (extended SMTP with SMTP authentication). It can also negatively impact an operator’s reputation and consume a lot of their time, which, in turn, drives up costs. ![]() First, it results in higher traffic due to the opportunities it provides for spammers. This is why it’s important to take SMTP authentication seriously.įor operators of mail servers, having a server that is being used as an open mail relay has multiple consequences. Once placed on a blocklist, even legitimate emails can end up in spam folders. Open mail relays can usually be identified in a few hours or days, and servers that are identified as such are placed on blocklists. Often though, the problem results from poorly configured firewalls and external security applications. Sometimes, this is due to the fact that administrators who lack experience want to test their server and underestimate the risks associated with temporarily opening it. Although the situation is no longer as critical as it was in the past, it’s still common to find open relay servers that don’t have SMTP authentication set up. SMTP AUTH prevents an SMTP server from being misused as an open mail relay, through which spam can be spread throughout a network. In addition, log data can be used to determine who has used the server for SMTP relays. This ensures that only trustworthy users can send and forward emails through the server. It allows an SMTP client to log on to an SMTP server using an authentication mechanism. SMTP authentication, also known as SMTP AUTH or ASMTP, is an extension of the extended SMTP (ESMTP), which, in turn, is an extension of the SMTP network protocol.
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