Support for POP before SMTP would be very helpful

My company outsources our email service and the system requires "POP before SMTP" while JIRA seems to only support authenticated (or non-authenticated) smtp.

I have seen a few posts about this on the forum and in your defect tracking system (JRA-9265, JRA-2310) but the people reporting the issue seemed to have control over their email server. It would definitely be helpful for us to be able to check a box on the JIRA mail server configuration screne that causes JIRA do a quick POP request prior to dealing with its outbound email.

I thought about setting up the issue/comment creation feature of JIRA that does use POP with the hope that those would fire frequently enough to ensure the "POP before SMTP" is statisfied, but since that service is decoupled from the Mail Queue Service, it seemed like a fragile solution.

Below are the relevant lines from the log of "Send a Test Mail". As shown in the DEBUG lines below, I do have authenticated SMTP set up, but that doesn't seem sufficient for my email provider. I have put in a request for the IP of my JIRA deployment to be added to a "trusted IP" list on our mail server for relaying, but since the service is outside of my control, I don't know if it will go through.

An error has occurred with sending the test email:
com.atlassian.mail.MailException: javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
class com.sun.mail.smtp.SMTPAddressFailedException: 550 Relaying Denied. Not A Local Domain: yahoo.com. If you are a customer, download messages via POP, and try again.

at com.atlassian.mail.server.impl.SMTPMailServerImpl.send(SMTPMailServerImpl.java:182)
at com.atlassian.jira.web.action.admin.mail.SendTestMail.doExecute(SendTestMail.java:88)
at webwork.action.ActionSupport.execute(ActionSupport.java:153)
at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:54)
...

DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "mail.nevo.com", port 25, isSSL false
220 X1 NT-ESMTP Server mail.nevo.com (IMail 6.06 471979-4)
DEBUG SMTP: connected to host "mail.nevo.com", port: 25

EHLO waycool
250-mail.nevo.com says hello
250-SIZE 0
250-8BITMIME
250-DSN
250-ETRN
250 EXPN
DEBUG SMTP: Found extension "SIZE", arg "0"
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "DSN", arg ""
DEBUG SMTP: Found extension "ETRN", arg ""
DEBUG SMTP: Found extension "EXPN", arg ""
DEBUG SMTP: use8bit false
MAIL FROM:<issues@nevo.com>
250 ok
RCPT TO:<petejaffe@yahoo.com>
550 Relaying Denied. Not A Local Domain: yahoo.com. If you are a customer, download messages via POP, and try again.
DEBUG SMTP: Invalid Addresses
DEBUG SMTP: petejaffe@yahoo.com
DEBUG SMTP: Sending failed because of invalid destination addresses
RSET
250 ok its reset
QUIT
DEBUG SMTP: bad server response: 250 ok its reset