Yes, but this happens for 3 days already. All other mails (register, for example are not delivered anymore. Community works, but all emailing - not).
I found very similar issue - Extreme memory usage due to bad mail credentials. So look like this is some kind of tricky bug.
The only way I found in order to stop this - I removed the auth token in my SMTP provider. Discourse start showing hundreds of errors and only after that load decreased. I restored the token and now all seems ok.