This is a buffer where the emails are stored before they hit the endpoint. If the recipient’s server is not available (down or busy), the email will be put into an SMTP queue. The sender’s SMTP server connects to the recipient’s SMTP server and relays the email.The DNS provides the recipient’s IP address.If the domains are different, the SMTP server has to communicate with the Domain Name Server (DNS). If it is, the email goes directly to the recipient’s POP3 or IMAP server. The SMTP server, or more precisely the mail transfer agent (MTA), checks whether the domain name of the recipient and the sender is the same.The client submits the sender’s and recipient’s email addresses, as well as the email body and attachments, to the server.But there are other options you can learn in our blog post about SMTP ports. ![]() The connection is carried out via an SMTP port, which is normally 25. A mail user agent (MUA), which can be your email client or an app, connects to the SMTP server of your domain (for example, ). ![]() Take a look at the basic steps of email sending and what role the SMTP server plays. For more on the Difference Between IMAP, POP3, and SMTP Email Protocols, read our blog post. ![]() The main difference between these protocols is that IMAP servers always store copies of emails, while POP3 servers delete them once they are retrieved. ![]()
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