System Five Add-Ons & Integrations help simplify the way you do things.
Our catalog of services has topic-based, role-based, or technical plans that can help you maximize your software investment.
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The error comes up when sending out email from System5. In this case, we are emailing directly from System5 but shouldn't be any different from emailing through an Email Client.
The quickest way out of it, is to use the Alternate SMTP Port Number (587).
Format: SMTP Mail Server:587