Mautic is a widely used open source email marketing automation application written in PHP. Email marketing is typically used in conjunction with inbound marketing done by asking people to give their email address in exchange for something, like a free ebook or a newsletter with good content. As you’re asking for the email address on a publicly facing webpage, spambots will find your form, and start misusing it to send your “Welcome” emails all over the place. This in turn may result in lots of bounces and/or complaints, which may get you locked out from your email service provider unless you pay attention. So, you need a way to block or fool those spam bots to prevent such issues, and to keep the Mautic database clean.

We use Zimbra as our main email server. We also have Office 365 subscription to make working with our clients a bit easier. The challenge is that when customers send us, say, Teams meeting invites, they typically use autofill and the email gets sent to our Office 365 mailboxes which nobody really looks at.

It is possible to fix this by configuring email forwarding. That is theoretically possible out of the box on a per-user basis in https://outlook.office.com/mail/options/mail/forwarding. However, when you actually try it out you will get an error message in your Office 365 inbox because forwarding is disabled on the organizational level by default: