mailbox not available

[quidnun]

I'm running this in docker in either the default or -multiapp mode and this is the error it throws via telnet

MAIL FROM: <(apitoken)@pushover.net>
250 2.1.0 Ok
RCPT TO: <(usertoken)@pushover.net>
550 5.1.0 Requested action not taken: mailbox unavailable

where (apitoken) is the apitoken and (usertoken) is the user token. I'm not familiar enough with docker (windows host) to know if there is a configuration problem or there is some issue with the smtp-translator service. is there is a log for smtp-translator? it seems like the container has internet (ping works)

[YoRyan]

I've never seen this error before. Seems like the recipient address you submitted failed to pass the regex. You're not literally enclosing the usertoken in parantheses, are you?

To be perfectly honest with you, I'd recommend switching to my newer project, Mailrise, especially since you're using Docker.