Are there reasons to not reduce Mail Notification Send Interval for faster notification?

By default, a Jazz server sends mail notifications every 10 minutes, if there are any notifications to send. This is configurable on the JTS advanced properties page, Mail Notification Send Interval. Are there reasons to not set this to a much smaller value, so users receive mail notifications sooner? We set it to 30 seconds on one server, and it is working fine. In an answer to another question, a Jazz developer wrote that 'the "delayed" email notification is by design', but did not explain why. A couple possibilities:

- An SMTP server might block frequent connections from an IP address. Not a problem for our servers.
- It is more efficient to send multiple messages over one SMTP connection than to connect/disconnect multiple times. For us, the benefits of faster notification outweigh this small impact on the RTC and SMTP servers.

Anything else we should consider before making this change on more servers?

Thanks,
Greg