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What SMTP+ is and when to use it

SMTP+ is a SMTP relay service built right into your MailUp account. SMTP+ makes MailUp a truly complete email delivery solution in that you can now use it not just to create and send email marketing campaigns and triggered messages, but also to send transactional, and personal emails. For example:


titleNot for promotional campaigscampaigns

SMTP+ is not to be used for bulk promotional campaigns but only for personal or transactional messages. For more details, please contact


 Regular SMTP serverMailUp's SMTP+
DeliverabilityPotentially low (1)(star) High
StatisticsNone(star) Detailed at user level
ScalabilityLimited (2)(star) High
Header/footerMust be in the message(star) Can be automatically added
Notifications (e.g. bounces)To the sender(star) Customizable (e.g. sent to IT staff)
Triggered EmailsNone(star) Unlimited
Recipients databaseNone(star) Automatically created
UnsubscriptionsManual(star) Automated
Bounce managementManual(star) Automated
Feedback Loop managamentNone(star) Automated
Sending messages in CCNLimited(star) Unlimited. The BCC recipient receives the message with the address in the To field
Sending attachmentsLimited(star) Up to 20MB 10MB

(1) You are at the mercy of your SMTP server's reputation, which is affected by all the companies that are using it. For example, if your Web hosting company has deliverability issues, you would be negatively affected