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550 Denied by policy (Exchange 2013)

Hi guys,

I'm having this weird problem at the moment.

I'm running Exchange 2013 on a Server 2012R2 VM.

I'm having problem sending email out to a particular domain only.
The error is simply, " 550 Denied by policy."

This is what I see when I turn on logging on the send connector.
2014-06-02T08:44:27.997Z,Internet,08D143A0F68C27F6,2,192.168.1.20:29644,148.173.91.30:25,<,220 APPCLDMEG002.gso.aexp.com EGVA/SMTP Ready.,
2014-06-02T08:44:27.997Z,Internet,08D143A0F68C27F3,14,192.168.1.20:29628,207.46.163.247:25,<,221 2.0.0 Service closing transmission channel,
2014-06-02T08:44:27.997Z,Internet,08D143A0F68C27F6,3,192.168.1.20:29644,148.173.91.30:25,>,HELO Exchangeserver.mydomain.com,
2014-06-02T08:44:27.997Z,Internet,08D143A0F68C27F3,15,192.168.1.20:29628,207.46.163.247:25,-,,Local
2014-06-02T08:44:28.363Z,Internet,08D143A0F68C27F6,4,192.168.1.20:29644,148.173.91.30:25,<,"250 Requested mail action okay, completed.",
2014-06-02T08:44:28.364Z,Internet,08D143A0F68C27F6,5,192.168.1.20:29644,148.173.91.30:25,*,,sending message with RecordId 6124623364730 and InternetMessageId <41c96145435e4333b290c7c85bcb8ae7@Exchangeserver.mydomain.com>
2014-06-02T08:44:28.364Z,Internet,08D143A0F68C27F6,6,192.168.1.20:29644,148.173.91.30:25,>,MAIL FROM:<Administrator@mydomain.com>,
2014-06-02T08:44:28.576Z,Internet,08D143A0F68C27F6,7,192.168.1.20:29644,148.173.91.30:25,<,"250 Requested mail action okay, completed.",
2014-06-02T08:44:28.576Z,Internet,08D143A0F68C27F6,8,192.168.1.20:29644,148.173.91.30:25,>,RCPT TO:<castsingapore@aexp.com>,
2014-06-02T08:44:28.851Z,Internet,08D143A0F68C27F6,9,192.168.1.20:29644,148.173.91.30:25,<,"250 Requested mail action okay, completed.",
2014-06-02T08:44:28.853Z,Internet,08D143A0F68C27F6,10,192.168.1.20:29644,148.173.91.30:25,>,DATA,
2014-06-02T08:44:29.059Z,Internet,08D143A0F68C27F6,11,192.168.1.20:29644,148.173.91.30:25,<,"354 Enter mail, end with ""."" on a line by itself.",
2014-06-02T08:44:29.329Z,Internet,08D143A0F68C27F6,12,192.168.1.20:29644,148.173.91.30:25,<,550 Denied by policy,
2014-06-02T08:44:29.338Z,Internet,08D143A0F68C27F6,13,192.168.1.20:29644,148.173.91.30:25,>,QUIT,
2014-06-02T08:44:29.339Z,Internet,08D143A0F68C27F6,14,192.168.1.20:29644,148.173.91.30:25,-,,Remote

Any clues or directions as to where i should be looking?
No such problems when sending to any other domains though (thankfully)

Thanks again in advance!

Andy

Christophe Gillent

This usually means your SMTP server is blacklisted for that domain...

Check out if you are indeed: http://mxtoolbox.com/blacklists.aspx

Nordicit

ASKER

Hi Christophe, I can confirm that my SMTP server IP is not blacklisted using mxtoolbox's check.

I've contacted the aexp.com guys to whitelist us, but they say they are not blocking any of our e-mails.

:| Any other suggestions?

ASKER CERTIFIED SOLUTION

Christophe Gillent

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Andy M

Is it just to a particular email address or the domain in general? If it's an address then it could be the user has added you to their blocked senders list (we've had loads of our clients do that without realising) which I believe results in same bounceback.

Nordicit

ASKER

Hi Christophe, Morty500UK,

Will get the recipient to check on their end again before reverting, thanks!

Meantime, is there a possibility of our internal connectors blocking anything? Running Exchange 2013 std

Gareth Gudger

They may have manually added your domain or IP to a blacklist. Your PTR record may also not match your banner. Or could be some weird content filtering on their side. Does this issue also occur if you manually telnet to them?

Lars Biemans

In my case I was able to solve this by enabling DKIM for the domain.