Do Linode IP have trouble with AOL? (421 DYN:T1 block)
However, now that I'm on Linode, I'm getting AOL's 421 DYN:T1 block and my Linode's IP address reputation is "undisclosed". I have reverse resolution set up consistently (the MX host resolves to an IP address that reverse-resolves to the MX host) and I have SPF and DKIM set up. I have verified (by adding my gmail address to the mailing list membership) that SPF and DKIM are set up properly, since gmail is showing both the SPF and DKIM tests passing.
Any idea why AOL is putting this block on my list's mails to AOL members from my Linode? Does Linode generally have trouble with AOL? Is it because AOL is seeing my Linode IP address fresh and I have to build up reputation (or maybe the previous person who had this IP address "trashed" it somehow?)
5 Replies
Postmaster Website
The site also has a list of the error code explanations:
> 421 DYN:T1
The IP address you are sending from has been temporarily rate limited due to lack of whitelisting, unexpected changes in volume, or poor IP reputation.
So, most likely, the IP address you're sending from isn't whitelisted
@obs:
I've never had a problem with Linode and AOL have you checked if the IP is on any spam lists? (What is the IP?)
I have checked (I used MxToolbox's meta-checker (
it said it checked my IP (66.175.210.91) against 105 RBLs and it was not on any of them (though eight of the RBLs timed out).
@hoopycat:
AOL's
Postmaster WebsiteThe quick and easy way to handle this is to do the migration over the span of a few months; start routing a couple deliveries per day via the new server, then a couple more, etc, until it's all good. But I suppose the horse is already out of the barn on this one. At least it's a 4xx error, so it'll keep retrying until it goes through (or bounces).
That's not really possible – the server being migrated from goes away next month
Also, this isn't a high-volume list. It's only 10-30 messages per day, and there are only 170 addresses on it, of which only 12 are AOLers. So AOL is only getting 120-360 messages/day from my IP address. And the day of the migration there were only about 5 messages.
But thanks for the pointer to that Postmaster website!
I opened up a paid web-only account with AOL and worked my way to level 2 support to get someone to contact the Postmaster department. I was told they are actually located in an office "unreachable by phone", so all correspondence has to be done through that site. After a few weeks of pressing support, I finally got an email back from the postmaster saying our server had been whitelisted.
Hopefully your experience will be speedier and more pleasant!
Gary Thorne