IMCEAMAILTO errors in Exchange

Ever get this weird error?

mailto:IMCEAMAILTO-emailaddress%2B40domain%2B2Ecom@localdomain.com>

#550 5.4.4 ROUTING.NoConnectorForAddressType; unable to route for address type ##

I encountered this weird error today. What is that weird e-mail address? IMCEAMAILTO ?? This is what outlook interprets when a user clicks a hyperlink for a " mailto:emailaddress@domain.com" within an email in outlook to send a new message.

For some reason, outlook does't actually parse the MAILTO: but instead adds the MAILTO: as part of the email address that you are sending to.

The problem doesn;t stop there unfortunately, because outlook wants to remember every address you ever wrote to )the suggested contacts list), it will actually save the email address for that specific contact, which, will present itself as a contact called "emailaddress@domain.com" with the email address "MAILTO:emailaddress@domain.com".

To solve this problem permanently for that specific address, we need to dig a bit more and change the email address stype back to SMTP: