I use plus addresses (e.g. "foo+maillists.groups.io@...") for my subscriptions.  When messages are bouncing, I get a request URI which does not escape the "+",server side translates this to whitespace and debouncing fails without any comment.

This is the case both for E-Mail messages

| You must take action to restore your account. To unbounce your account, go to the following link:
|
| https://groups.io/unbounce?email=maillists.groups.io@...&cookie=.....

and the link in the banner on the website.


groups.io should escape the '+' to '%2b'

[Mod note: Added a subject to the message.]