Webhook with username is always invalid in TXT record

[sparksp]

Using the example from the FAQs forward-email=alias:https://requestbin.com/r/en8pfhdgcculn the below line of code will find the username as alias:https and the target as //requestbin.com/r/en8pfhdgcculn which is invalid.

https://github.com/forwardemail/forwardemail.net/blob/6949cdf5748ec6971e010d3582dd7c11971b6e60/app/models/domains.js#L1867

Using a regex username or a global rule works fine.