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Setup & how-to

SMTP settings for outgoing email

The SMTP settings determine how your email goes out. With Mailflux you send via the outgoing server on port 465 with SSL/TLS, and you sign in with your full email address and password. You enter those three details in your mail program, and then outgoing mail works right away. You don't need deep technical knowledge for this: we'll set it out briefly.

By the Mailflux team Published on

Reading and managing email in the webmail, on any device

What is SMTP?

SMTP stands for Simple Mail Transfer Protocol: it's the standard your mail program uses to send your messages to the server for delivery. Receiving happens via IMAP; sending happens via SMTP. Want the background, then read what SMTP is.

What you need

  • Your full email address (for example jij@jouwzaak.be) and the password of that mailbox.
  • The Mailflux outgoing server name and port. The port is the default value below; you'll find the exact server name in your Mailflux account or on the page IMAP and server settings.
  • A mail program in which you set up an account or adjust the outgoing server.

SMTP settings: step by step

You enter these values in the Outgoing server (SMTP) section of your mail program:

  1. In your mail program, open the account settings and go to the outgoing server (SMTP).
  2. Under Server, enter the Mailflux server name.
  3. Set the Port to 465.
  4. For connection security, choose SSL/TLS.
  5. Turn on Authentication required (sometimes called "authentication" or "sign-in required").
  6. As the Username, enter your full email address and use the password of your mailbox.
  1. Save and send a test message to check whether everything is correct.

The incoming (IMAP) values are separate from this; you'll find them together with the outgoing ones at IMAP and server settings.

Port 465 or 587?

Use port 465 with SSL/TLS: that's the recommended, encrypted connection for outgoing mail. Some programs work with port 587 and STARTTLS as an alternative; that's also a secure connection, but the encryption is set up a little later in the conversation. When in doubt, choose 465 with SSL/TLS. Never send unencrypted (port 25 without security).

Not working?

  • Receiving works but sending doesn't. That almost always points to the SMTP settings. Check port 465, SSL/TLS and that authentication is on.
  • "Sending failed" or sign-in refused. As the username, enter your full email address, not just the part before the @.
  • No connection to the outgoing server. Sometimes a network blocks port 465. Try a different network or check the server name.
  • Password error. Watch out for typos and capital letters and use the password of the mailbox itself.
  • Still stuck? The full, up-to-date server values are at IMAP and server settings.

Done, and need help?

Send a test message to yourself. If it arrives, your SMTP settings are correct and outgoing mail now goes out smoothly. Want to understand what happens under the hood, then calmly read on about how SMTP works. Keep the up-to-date server values at hand via IMAP and server settings.

Ready to get started?

Follow our step-by-step guide, or let us help you get set up personally.

Read the guide

FAQ

Frequently asked questions

Do I need to set up SMTP separately or is it part of my account?

Usually you set up SMTP together with your account: your mail program asks for both the incoming (IMAP) and the outgoing (SMTP) server. If sending goes wrong, you only adjust the Outgoing server (SMTP) section with port 465, SSL/TLS and your full email address as the username.

Why does outgoing mail have to sign in with my password?

Authentication on the outgoing server prevents someone else from sending via your address. That's why Mailflux also asks for your full email address and password with SMTP. Without that sign-in the server refuses your message, and you often see a "sending failed" notification in your mail program.

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