SMTP IMAP Settings

How to access MailSlurp email accounts using IMAP and SMTP servers

smtp send and read email

See the IMAP/SMTP documentation for a developer guide.

MailSlurp gives you SMTP and IMAP access to email addresses that you create. For best results use the SMTP_INBOX type email mailbox when you create the address. You can get SMTP or IMAP access details inside the dashboard or by using the API to get your credentials.

Find your SMTP IMAP settings

Login to your MailSlurp account or create a free account. On the dashboard homescreen you will see a tab of account details. Click the SMTP/IMAP tab to reveal your SMTP IMAP settings.


Server overview

Here are the main URLs for IMAP and SMTP access:

Protocol Host Port TLS Description
SMTP 2525 false SMTP server
IMAP 1143 false IMAP server
HTTP(S) 80 true REST API server

Note that only inboxes created with the SMTP_INBOX mailbox type allow access via SMTP and IMAP. See the guide for differences in inbox type.

Get IMAP / SMTP access by curl

You can also access your SMTP or IMAP settings using the command line with your API_KEY.

curl -Hx-api-key:YOUR_API_KEY

Get IMAP / SMTP access in code and tests

There are methods in every offical code library like getImapSmtpAccessDetails that return the SMTP and IMAP settings for your account. Use these details to configure SMTP clients in your applications or tests.

const {MailSlurp} = require('mailslurp-client');
const nodemailer = require("nodemailer");
const apiKey = process.env.API_KEY;
const mailslurp = new MailSlurp({ apiKey });

// get access details for smpt server
const server = await mailslurp.getImapSmtpAccessDetails();

// use details to configure SMTP client like NodeMailer
const opts = {
    host: server.smtpServerHost,
    port: server.smtpServerPort,
    secure: false, // Disable tls recommended
    auth: {
        user: server.smtpUsername,
        pass: server.smtpPassword,
        type: "PLAIN" // Note the use of PLAIN AUTH
const transport = nodemailer.createTransport(opts)

CSharp example

using System;
using System.Net;
using System.Net.Mail;
using mailslurp.Api;
using mailslurp.Client;
using mailslurp.Model;
using Xunit;

namespace SmtpService.Tests
    public class UnitTest1
        public void CanSendEmailWithMailSlurpSmtp()
            var apiKey = Environment.GetEnvironmentVariable("API_KEY")
                         ?? throw new ArgumentNullException("Missing API_KEY environment variable containing MailSlurp key");

            // configure client
            var config = new Configuration();
            config.ApiKey.Add("x-api-key", apiKey);
            var inboxController = new InboxControllerApi(config);

            // create an smtp inbox
            var inbox = inboxController.CreateInboxWithOptions(new CreateInboxDto(
                inboxType: CreateInboxDto.InboxTypeEnum.SMTPINBOX
            Assert.Contains("", inbox.EmailAddress);

            // get smtp host, port, password, username etc
            var imapSmtpAccessDetails = inboxController.GetImapSmtpAccess();
            var smtpClient = new SmtpClient(imapSmtpAccessDetails.SmtpServerHost)
                Port = imapSmtpAccessDetails.SmtpServerPort,
                Credentials = new NetworkCredential(userName: imapSmtpAccessDetails.SmtpUsername, password: imapSmtpAccessDetails.SmtpPassword),
                // disable ssl recommended
                EnableSsl = false
            // send email to inbox
            smtpClient.Send(from: "", recipients: inbox.EmailAddress, subject: "This inbound", body: "Hello");
            // wait for email to arrive
            var waitController = new WaitForControllerApi(config);
            waitController.WaitForLatestEmail(inboxId: inbox.Id, timeout: 30_000);

More information

Related content

Fake SMTP servers for safe testing that prevent any outbound emails from reaching real users

Test emails safely with no risk of spamming users with real emails

Java email library for SMTP and creating email addresses

MailSlurp Java SDK for sending and receive email and attachments on the JVM.

SMTP email application libraries

How to send email in CSharp, PHP, Ruby, Java, Python, and NodeJS using the SMTP protocol and MailSlurp mailservers.

1111 SMTP Connections failing

1111 SMTP Connections failing

How to Send an Email in Python

Send emails using SMTP mailer in Python. Detailed tutorial for sending mail in Python.

How to send emails in Javascript (NodeJS)

JS SMTP email sending guide using HTML and NodeJS.

PHPMailer tutorial (Sending email with PHP)

PHPMailer tutorial (Sending email with PHP)

How to send an email using Powershell (Windows and cross-platform)

Use Send-MailMessage in Windows Powershell to send emails using an SMTP server or MailSlurp's free email API.

How to send email in R

RLang tutorial for sending emails over SMTP.

SMTP Commands and Response Codes List

A full list of commands and response status codes for SMTP mail servers when sending emails.

Test SMTP servers with Telnet

How to use Telnet to test the SMTP servers?

What Is Amazon Simple Storage Service (SES) - And How Can I Use It?

Amazon SES is an email service among virtual servers, AI apps, and libraries. Ideally, you can integrate your email system with your program hosted on Amazon.

Grab all details about an SMTP Port

What are common SMTP mail server ports and how do you find them?

Which SMTP Port Should I Use?

Picking the right port for SMTP mailservers

Avoiding email spam filters

How to send emails that don't trigger a spam warning.

BCC and CC in SMTP emails

What is cc and bcc in email? What is the difference between cc and bcc?

BCC For Email: What It Means And When To Use It

What is BCC email field (blind carbon copy) and how does it differ to CC?

What Is The Best SMTP Port To Use?

MailServers use TCP ports to transmit emails. Picking the right port between 25 vs 2555, 465 vs 587 in SMTP is easy with this guide.

How to configure Mail desktop clients with MailSlurp

How to setup MailSlurp with Outlook, Gmail, Thunderbird, Mail app and more.

Send email with CSharp using SMTP Client and MailSlurp

Create a custom SMTP client and access MailSlurp inboxes from CSharp/DotNET.

DMARC – All Facts that you should know

DMARC – All Facts that you should know

Email size limits

Email size limits

The Fundamentals Of Email Subdomains

How to manage email subdomain custom mailboxes using SMTP/IMAP mailserver settings.

How to send emails in VBA

Send email in Visual basic

A guide to PHP Mailer

A guide to PHP Mailer

SMTP IMAP Settings

How to access MailSlurp email accounts using IMAP and SMTP servers

SMTP Relay for outbound smtp servers

How to use SMTP relay to address spam and security issues that affect outbound mail servers.

SMTP vs HTTP MailSlurp inboxes

The difference between HTTP and SMTP inboxes and domains in MailSlurp.

What are SMTP ports

What are SMTP ports

CSharp send SMTP email

How to use CSharp SMTP client to send email with MailSlurp mail server

Send SMTP email with Java

How to use Java SMTP client to send email with MailSlurp mail server on the JDK

Send emails in NodeJS using SMTP

How to use Javascript SMTP client (or Nodemailer) to send email with MailSlurp mail server

Send SMTP emails with PHP

Use PHPMailer to send emails with SMTP and MailSlurp

Send SMTP email with Python (using SMTPLib)

How to send emails with Python's built-in SMTP client and MailSlurp mail servers.

Ruby send SMTP email

How to use Ruby SMTP client to send email with the MailSlurp mail servers

Ready to dive in?Start building email applications today.