Zoho ZeptoMail Weblog | SMTP and SMTP safety


How is an e mail despatched? You sort it out in your laptop, hit ship, and it magically reaches your recipient, proper? Effectively, whereas it could appear to be magic, it’s principally because of the SMTP server that your e mail supplier arrange.

What’s an SMTP server?

SMTP stands for Easy Mail Switch Protocol. SMTP servers are the explanation your e mail reaches your recipient’s inbox. Whereas it’s referred to as a server, it’s not a bodily machine. It’s an utility that retains working with the singular objective of relaying emails between a sender and recipient.

The SMTP server does for emails precisely what the postman does on your bodily letters. This server ensures that the e-mail you ship out of your e mail consumer reaches your recipient’s inbox intact. The message you hit ship on will get transformed right into a code that may be transported to the SMTP server for processing and relaying. With out the STMP server, this code won’t be processed and your message will probably be misplaced.

SMTP additionally acts as your first layer of e mail safety. SMTP can be utilized to carry out callback verification that can assist confirm that the e-mail originated from a sound/energetic e mail account.

There are a number of steps and processes that happen between hitting the ship button and the recipient receiving the e-mail. Check out how this digital postman (SMTP server) works in sending an e mail from ZeptoMail to a recipient utilizing Zoho Mail:

  1. As quickly as you hit ship on the e-mail, your e mail consumer establishes a reference to the ZeptoMail SMTP server.
  2. The e-mail consumer conveys the main points of the message, sender, and recipient with the ZeptoMail SMTP server.
  3. The ZeptoMail SMTP server then processes the knowledge despatched by the e-mail consumer.
  4. It first identifies the area and the SMTP supplier internet hosting the area. The SMTP server additionally will get the recipient supplier’s distinctive IP tackle.
  5. As soon as it has the details about the recipient server, ZeptoMail’s SMTP server runs a test to confirm that the sender is an energetic e mail account to stop spam.
  6. After the verification is profitable, ZeptoMail’s SMTP server arms over the message to the recipient SMTP server—in our case, the Zoho Mail SMTP server.
  7. If the recipient e mail tackle is appropriate, the Zoho Mail SMTP server delivers the message to the recipient’s inbox.
  8. If the recipient tackle is just not legitimate, the e-mail is shipped again to the sender together with all of the related data.

Contemplating that your SMTP server actually handles each single e mail you ship out, you’ll be stunned that the usual SMTP protocol comes with no safety of its personal. So why do we want SMTP safety?

Unauthorized entry

Essential data is transmitted by way of e mail. With out good SMTP safety in place, unauthorized individuals can acquire entry to your emails. This knowledge can then be leaked or used for his or her benefit.

Spam and phishing

If an unauthorized particular person will get entry to your SMTP server, they’ll ship out spam emails to your contacts. In some instances, they’ll additionally impersonate you and ship malicious emails to your contacts and acquire confidential data.

Deliverability points

As soon as these fraudsters use your SMTP server for spamming and phishing, e mail suppliers will view your emails as untrustworthy. It will find yourself inflicting deliverability points on your professional emails.

Malware and e mail assaults

Attackers can use your SMTP server to unfold malicious software program to recipients of your emails and likewise inside your personal methods. They’ll additionally use the SMTP entry to carry out e mail assaults like DDOS to hurt different servers.

Should you’re questioning if there’s a easy option to ship emails securely utilizing SMTP, there positively is.

ZeptoMail is a transactional email-sending service that allows you to ship transactional emails out of your utility/websites utilizing SMTP. You should utilize the SMTP configuration to ship emails in a fast few steps.

You additionally don’t want to fret about securing the SMTP server—we’ve bought it coated.

ZeptoMail takes a number of measures to guard your e mail sending over our SMTP connection.


ZeptoMail provides a layer of safety by utilizing TLS connections. SSL/TLS connections encrypt the e-mail message when being despatched from the e-mail consumer to the SMTP server. So even when the server is breached, attackers will solely have the ability to see codes that can not be deciphered. ZeptoMail helps TLS v1.2 to eradicate the restrictions of earlier variations.

SMTP account authentication

SMTP e mail sending in ZeptoMail is finished utilizing distinctive passwords. When your utility connects to our SMTP, your id is verified utilizing the password. Every Mail Agent comes with distinctive SMTP credentials that help you isolate the status of various e mail classes that may be primarily based on sort, utility, objective, setting, and extra.

Area verification

The primary and most vital step in ZeptoMail onboarding is area verification. Each area added on our platform is authenticated utilizing SPF, DKIM, and CNAME. This helps show your id to our SMTP server and likewise protects you from spammers and spoofing.

IP restrictions

ZeptoMail enables you to handle e mail sending from completely different IPs utilizing IP restrictions. You’ll be able to add IP addresses/ranges from which you enable e mail sending. Whereas your account may be accessed from any IP, e mail sending can solely happen from the offered IP addresses.

These are simply a few of the safety measures ZeptoMail has in place. We even have e mail APIs that enable for a deeper integration of your utility/web site with ZeptoMail.

And that’s all we’ve for right now—I’ll be again to inform you extra about these options in our upcoming blogs. Belief me that we’re exhausting at work developing with extra methods to make your ZeptoMail expertise even higher! Within the meantime, give our newest updates a attempt to share your suggestions with us on social media, via e mail, or within the feedback beneath!

You may also comply with us on Twitter and LinkedIn and be part of our group discussion board for normal updates.

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