So, our company uses Google Apps for it's email hosting (aming other things), however something very strange occurs pretty regularly- email messages sent from external MTAs (i.e. tampabay.rr.com, T-Mobile's Blackberry e-mail service, a notification service sent by an external company that a company we have a contract with, etc.) sometimes take several hours to deliver into some of our mailboxes.

Is there any reason this happens regularly? I have verified myself that our MX records match what Google says they should be. Is there anything that I'm missing, perhaps?

1 Answer 1


No, you're not missing anything.

You may find that Google is doing greylisting behind the scenes. I know from personal experience that Road Runner (rr.com) is notorious for allowing spammers on their network. So Google may be forcing the MTAs to resend the messages with a specific timeout.

  • If the "external" mail servers are always the same, adding them in an SPF record about your domain.
    – adamo
    Nov 6, 2010 at 19:30
  • But it's not just rr.com, and isn't all the time. We receive automated email from a company called Laker Software, and they have email notifications whenever we submit .csv files to them and they get processed Those queue up for sometimes half a day, and then I'll sometimes get a batch of 60 emails for that exact duration. Nov 6, 2010 at 19:31
  • @adamo Eh? Say what now? Nov 6, 2010 at 19:33
  • I was using rr.com as an example, but check with Laker Software that there isn't an SPF issue with your domain. You may be greylisted yourself in some RBL.
    – user3914
    Nov 6, 2010 at 19:35
  • @Randolph Thanks. How would I find out if we've been greylisted? And more importantly, how would we become un-greylisted? (if indeed that is the case) Nov 6, 2010 at 19:39

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.