Github user ijokarumawak commented on the issue:
https://github.com/apache/nifi/pull/483
@trixpan I am not sure 100% yet about the javax.mail.SocketFetcher's
behavior, but I recommend to set higher value as default for `Maximum number of
SMTP connection`, such as `1,000`, and probably validate it to be at least 2,
to avoid getting `Too many connection` error.
org.subethamail.smtp.server.SMTPServer's default is 1,000. Conservative users
may set 1 and will encounter the issue..
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
