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Configuring SMTP+ feature in your platform and MailUp

SMTP+ users will need to first configure SMTP+ in MailUp (see Configuring Server Access and users in MailUp) and then you use the SMTP+ credentials to configure the MailUp SMTP+ in your own application/email client.

Configuring server access and authorized users in MailUp:

Creating a separate list

Although it's technically not a requirement, we recommend that you create a new List in your MailUp account to be used for SMTP+. Messages, statistics, and other settings will be easier to manage that way.

Once you have created a new List, you can start configuring SMTP+ in the List settings area.

Managing users

The page Settings > List settings > SMTP+ > Settings displays the following information:

  • data for SMTP+ configuration within your mail client: SMTP server address, port, and type of encryption
  • the list of the users that have been created (enabled or not) for SMTP+ message sending 
  • button for adding a new SMTP+ user


  • Edit: edit user settings (see below)
  • Delete: delete a user enabled to SMTP+ message sending
  • Add new user: create a new SMTP user through a menu that closely resembles the Edit menu

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Adding and editing SMTP+ users

What's on the add/edit user window

When you add or edit an SMTP+ user, you will see the window displayed below. In the top part of the window, you will find the credentials (user name and password) that you will enter in your email program as the outgoing mail server authentication credentials.

Below the credentials is the outgoing mail server address, and the port to be used, which are also needed to configure your email client.

Within your email client, you can configure


port 25 and all the ports from 1025 to 5000. On all the ports, you can have as an option the encryption through STARTTLS extension.


About creating and editing a SMTP+ user

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You can also modify some parameters related to each SMTP+ user

Verify your SMTP+ sender credentials

You will be asked to verify new email addresses and domains used for sending via SMTP+, MailUp's SMTP relay service. This is an email security improvement focused on limiting phishing attacks and unlawful use of your company's sending domain. Existing accounts have been automatically verified.

Where to find it: when adding a new account under Settings > List settings > SMTP+, you will be asked to verify new senders

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  • Once you have verified an address, remember to activate it, by checking the option Status > active user
  • It's not allowed to use SMTP+ by specifying the "from" sender from an online form. Because in this case, by definition, the sender would not be: verified and authorized.

Other features and parameters:

  • Reset password: creates a new password associated to with that user. Once it has been generated, the password cannot be read in any control panel. Anyway, it is possible to reset it as many times as desired.
  • User status active: the selected user is active if the corresponding box has been checked.
  • Priority: default priority associated to the user during SMTP+ message sending. The priority used by the system will be the higher between the priority associated to the user and the priority srt during the creation of the message.this is the priority displayed in the email client of SMTP+ messages recipients
  • Note: You can insert here a brief note for internal use about the user that you have just created
  • Authorized domains and authorized senders: authorized domains for SMTP+ message sending. If the email address (or its domain) used for sending is not among the indicated domains, the SMTP+ feature will create a Domain sender notification.


titleNotes on priority


  • domains: 
    • One or more domains authorized as senders, separated by ";" REMEMBER TO USE SEMI-COLON AND NOT A COMMA TO SEPARATE
    • All email addresses at those domains will be authorized. For example, you could enter:;
    • You can use both second-level and third-level domains: for example, 2nd level domain:; 3rd level domain:
  • Authorized senders:
    • specific email addresses authorized as senders, separated by ";" REMEMBER TO USE SEMI-COLON AND NOT A COMMA TO SEPARATE
    • For example;;
titleMessage not being sent?
See these troubleshooting tips.