While trying to figure out how to forward emails from the main domain to an external domain with the same address, I came across this article:

https://www.mailgun.com/blog/tips-tricks-guide-to-using-regular-expressions-to-filter-incoming-email-2/

However, the named capture example (I.e.) is wrong, it should have a \ in front of g:

forward('\g<user>@externaldomain.com')

I wasn’t exactly sure where to post this, but hopefully you guys can fix the blog post!