Safety In Email Deliverability

SMTP and Your Email

SMTP has to do with the protocols that ensure an email is delivered to the right recipient. We all think that email is a flawless system that gets your message delivered in a flash, but the truth is that there are a number of settings that need to be in place for this process to ensure deliverability. In this post, we’ll take a look at how you can troubleshoot email deliverability, as well as the importance of SMTP API to email infrastructure developers.

The SMTP is a set of instructions that lets two custom email servers communicate with each other for successful email delivery. Your email client uses SMTP to encrypt the information contained in your email, making sure that the contents of the email remain private. The common route used to send and receive emails around the world is port 25, which queues up emails sent, until a time when the email is received and read by the intended recipient.


Receiving an email requires you to have IMAP or POP infrastructure, which stands for Internet Messaging Access Protocol and Post Office Protocol. These two enable you to compose a message and send it off to the recipient via port 25 or 587 of the Simple Mail Transfer Protocol client, or SMTP in short.

SMTP email servers have no way of identifying who sent an email given the sheer volume of emails sent around the world. Back in the early eighties during the internet’s infancy, this was easy given the few individuals using it; this included government officials and military personnel

 IP Address

The recipient’s IP address is the main determinant that allows for successful email delivery from the SMTP servers. SMTP is vastly different from other internet protocol infrastructures such as HTTP and POP given its specialized use: email delivery. When troubleshooting email sending and delivery issues, pay attention to the port numbers. A single digit could mean the difference when it comes to successful email delivery. These settings are available from your internet service provider.


SMTP SPF, also known as Sender Policy Framework, is a system that domain owners use to specify the servers that they would like to send emails from their personal domains. They do this to ensure that the recipient’s server is able to verify the authenticity of the email, minimizing the chances of phishing or spoofing scams, which thrive on servers that have little or no security.


Domain Keys Identified Mail, also known as DKIM, is a modern means of authenticating email delivery. It works by signing all outbound emails with a special digital signature that can’t be duplicated or forged by other third party servers. You can verify DKIM by checking the security certificates downloaded on your browser. One particular downside when it comes to DKIM is that it allows spam to pass through to your inbox or spam inbox. However, it gives you information on the email source, which might be helpful if you ever want to unsubscribe from a given email service.

Please remember not to fiddle around with your SMTP settings unless you know what you’re doing. Email deliverability is a fine art that should be left to IT support professionals, especially if you have any doubts.

Featured images:
  •  License: Creative Commons image source

Slobac is familiar with the features that email servers offer that provide email delivery safety. Slobac browses the internet for Send Grid to receive quality services that provide safety for your emails.

Leave a Reply