You may have heard several names for a mail server, including mail relay, mail router, and Internet mailer. Among them, MTA (mail transfer agent) is one of the most commonly used terms for a mail server.

An MTA is a vital part of the Internet message handling system since it is in charge of transferring electronic mail messages between the sender and the receiver using the SMTP protocol.

Mail Transfer Agent

A software program called MTA acts as a bridge between the sender and the receiver. Between the two parties, emails are sent via this server.

The MUA sometimes referred to as an email client, receives the email first. The platform or application known as MUA is used to create emails. Following completion of the email, the MUA transmits it to the mail submission agent, who then submits it to the MTA.

The email is sent to the recipient's side by a mail delivery agent after being received by MTA. The email is eventually delivered to the recipient's mailbox after being received by MDA. Email distribution is accomplished via SMTP and POP3.

Mail Queueing

The mail after getting delivered from MTA is placed in a queue and awaits a response from the recipient's server. The mail will be redirected to the email server if it is not delivered within the specified time frame.

Factors That Impact Email Deliverability

Email delivery may get affected by sending server performance, user authentication nd te content of the email. The most crucial factor is the credibility of the website and the Default gateway to which the message is sent from. All emails from that sender will go into the spam folder or possibly bounce back when receiver web servers mark the sender as being unreliable. Mail transfer servers (MTAs) are crucial for this reason.

New IP Address

You could want to start with a brand-new IP address that hasn't sent any emails before and requires some settings to improve if you're trying to establish your internet identity. You may do this and afterward gradually raise your transmission capacity due to an MTA. Using fresh Email addresses is yet another solution. Minimum bounds can be used to filter email to cold IPs, and the MTA must match those limits.

Set up mail-sending workflows

Limits on incoming mail are established by each receiving domain independently. If they are surpassed, it may be possible to determine that the sending mail server is not reliable. Your MTA may be set up to dynamically restrict transmitting if you want to avoid this. You may use this to safeguard the integrity of your IP and website.

Surpassing the "grey list"

Some email providers employ greylisting as a kind of preventive action. You may configure email throttling and redirection protocols, keep track of the volume of outgoing mail, and do a lot more using MTAs. When an email bounces, an MTA sets up many queues and makes several tries to send it.

How To Select An MTA?

You must consider the following factors while considering an MTA.

  • Performance: which includes the speed, volume, and email sending capacity.
  • Configurability

Cloud-based relay service

The greatest choice you have for sending emails is an SMTP relay provider. You may send emails using this cloud-based system. The primary disadvantage is that you must share the infrastructure and it is not exclusively yours. Although some providers guarantee dedicated IPs, take into account that they are typically available to special senders.


With any MTA, you can anticipate a high degree of deliverability. While some users make full use of the onsite solution's capabilities, others choose the simple plan if they don't want to employ all of its features. Hence make sure your MTA meets the requirements of the project.

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