[outages] AOL MX inbound servers failing?

[Jeremy Chadwick]

This looks like greylisting on AOL's part.  You can Google the term and
read lots about it; it's a fairly common anti-spam tactic, but the
downsides to it are quite major (my opinion from running a hosting org
for ~18 years).

-- 
| Jeremy Chadwick                                   jdc at koitsu.org |
| UNIX Systems Administrator                http://jdc.koitsu.org/ |
| Making life hard for others since 1977.             PGP 4BD6C0CB |

On Fri, Oct 04, 2013 at 10:01:07AM -0400, Joshua Boniface wrote:
> Hello everyone:
> 
> For the last few days I've been noticing mail queuing on our mail
> servers with errors like this:
> 
> (delivery temporarily suspended: host
> mailin-03.mx.aol.com[205.188.190.2] refused to talk to me: 421
> mtain-df04.r1000.mx.aol.com Service unavailable - try again later)
> 
> The errors are transient, as forcing delivery tends to send them
> through. It's happening on many mail servers so it isn't a DNSBL
> problem on our end.
> 
> Has anyone else noticed this?
> 
> Thanks,
> Joshua Boniface
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