SMTPS: Port to use to secure SMTP with SSL/TLS

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SMTPS Port to use to secure SMTP with SSL/TLS

• What Is SMTP?
• SMTP is an acronym for Simple Mail Transfer
  Protocol. It is a set of communication protocols
  that allows applications to send electronic mail
  over the internet. It's an application that uses
  email addresses to deliver messages to other
  computer users. It allows users on the same or
  separate computers to exchange mail.
• It can transmit a single message to one or many
  recipients. Text, audio, video, and images may
  all be used to send messages. It can also send
  messages on networks outside the internet. SMTP
  is mostly used to establish communication rules
  between servers. The servers have a mechanism for
  identifying themselves and stating the type of
  communication they are attempting. They also have
  a system in place to deal with issues like wrong
  email addresses.

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SMTPS vs. SMTP

• In comparison to SMTP, SMTPS adds extra SSL or
  TLS cryptographic methods for increased security.
  The S stands for Secure.
• The SMTP protocol does not include encryption by
  default, therefore it may be used to send emails
  without any security. As a result, emails sent
  using SMTP are vulnerable to man-in-the-middle
  attacks or bad actors eavesdropping while the
  email is in transit. SMTPS, on the other hand,
  uses asymmetric cryptography to encrypt email
  conversations using TLS or SSL.

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Drawbacks of SMTP

• SMTPS-unsecured email is subject to a number of
  attacks that can alter the contents of a message
  or redirect it to an attacker before being
  delivered to the intended recipient.
• By inserting their own malicious SMTP commands
  into data as it is transferred from a server,
  attackers take advantage of the unencrypted
  interactions. These attacks can be used to send
  spam from the vulnerable domain, steal sensitive
  data invisibly, or carry out phishing assaults.

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Steps to Enable SMTPS 

• Enabling TLS on your mail server will secure
  SMTP. Enabling TLS encrypts the SMTP protocol on
  the transport layer by enclosing it behind a TLS
  connection. This successfully secures SMTP and
  converts it to SMTPS.
• SMTPS traffic is commonly routed on ports 587
  and 465. STARTTLS, which allows the email client
  to establish secure connections by requesting
  that the mail server upgrade the connection to
  TLS, is frequently used to encrypt SMTP
  communications via Port 587. 
• Implicit TLS is utilized on port 465, which can
  be used to allow secure email communications.
  This is suggested overusing STARTTLS on port 587,
  according to the IETF.
• Finally, port 2525 is occasionally utilized. To
  prevent consumers from creating their own mail
  servers, some residential ISPs would restrict
  port 25. Hobbyists and tiny home enterprises
  utilize port 2525 to combat this.
• Users can check their client settings to see if
  SMTP is enabled in their email client. Users of
  Outlook can confirm this by doing the following
  steps

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• Click on File gt Accounting Settings. Then open
  the Account Settings box.
• Choose your email from the Email tab, then click
  on the Change icon. In the Server Information
  section, ensure that the Outgoing Mail Server is
  set to your mail server address.
• Under the Outgoing Mail tab, ensure that SMTP
  requires authentication is checked.
• SMTPS can be enabled by system administrators
  via their SMTP connector's settings. Depending on
  whatever mail server you're using, this step will
  be different. There are choices for specifying
  the authentication type when configuring the SMTP
  connection, and TLS is one of them.

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• SMTPS protects messages while in transit from
  prying eyes. What about spoofing, phishing, and
  spam, though? Let's have a look at some email
  security standards you may use to secure your
  email and domain.
• Sender Policy Framework (SPF) Assists receivers
  in verifying that messages sent from your domain
  are indeed from you. SPF informs the rest of the
  world about the servers from which you and other
  domain owners like you send emails. The SPF check
  fails if a message is received from your domain
  that does not come from these servers.
• DKIM (Domain Keys Identified Mail) adds an extra
  layer of email authentication by adding a digital
  signature to the messages. This helps prevent
  tampering with communications while they are en
  route
• DMARC (Domain-based Message Authentication,
  Reporting, and Conformance) is a technical
  definition for authenticating communications by
  combining SPF and DKIM capabilities. One of the
  greatest methods to defend your brand against
  impersonation is to have DMARC completely enabled
  on your domain.
• Brand Indicators for Message Identification
  (BIMI) provides an extra degree of safety for
  domains that already use DMARC for authentication
  by displaying their brand logo in email
  communications. This makes it easier for
  receivers to tell if an email is real, and it
  also helps organizations increase brand
  recognition through email advertising.
• EmailAuth helps you with all of the following by
  automating DMARC, SPF, DKIM, and BIMI for your
  brand and helps you secure your emails without
  additional hassle. Check out EmailAuth.