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Within your email client, you can configure the following ports: 25 and all the ports from 1025 to 5000. On all the ports, you can have as an option the encryption through STARTTLS extension.Image Removed

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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Other features and parameters:

• Reset password: creates a new password associated to 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. You typically don't need to change this.
• Note: You can insert here a brief note for internal use about the user that you have just created
• Authorized 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: yourCompany.com;yourOtherCompany.com
  • You can use both second level and third-level domains: for example, 2nd level domain: yourCompany.com; 3rd level domain: marketing.yourCompany.com
    
• Authorized senders:
  • specific email addresses authorized as senders, separated by ";" REMEMBER TO USE SEMI-COLON AND NOT A COMMA TO SEPARATE
  • For example: info@yourCompany.com;sales@yourCompany.com;john.smith@yourCompany.com

How sender authorization works

The way the system handled non-authorized messages has changed.

• If all authorization fields are empty, all senders are authorized (i.e. both the authorized domains and authorized senders fields are empty)
• Prior to version 8.2.4 and above, an alert was sent when a non-authorized sender was detected, as configured in the Alert Center. The message, though, was still sent.
• With version 8.2.4 and above, a new feature was introduced that allows you to cancel the mailing if the sender is not authorized. When that feature is on and a message is sent from an unauthorized sender, the message is blocked and an alert is sent.

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