You receive a SMTP relay blocking error message when you try to send an e-mail (214402)
The information in this article applies to:
This article was previously published under Q214402 SYMPTOMS When you send e-mail messages you may receive an error
message that your e-mail cannot be sent due to SMTP relay blocking. The exact
error message may vary, depending on your Internet Service Provider (ISP);
however, it will be similar to the following error message:
The message could not be sent because one of the
recipients was rejected by the server. The rejected e-mail address was
'<someone@microsoft.com>'. Subject: '<Test>', Account:
'<Test>', Server: '<smtp.microsoft.com>', Protocol: SMTP, Server
Response: '550 <someone@microsoft.com>... Relaying Denied', Port: 25,
Secure (SSL): No, Server Error: 550, Error Number: 0x800CCC79
CAUSE This problem can occur with the following configurations:
- You are logged in to a Local Area Network (LAN) that has an
Internet gateway and attempt to send e-mail through an Internet Service
Provider's SMTP gateway.
- You are logged onto an Internet Service Provider (ISP) and
attempt to send e-mail through another Internet Service Provider's SMTP
gateway.
- You are using a cable modem or ADSL to get to another
Internet Service Provider and attempt to send e-mail through that ISP's SMTP
gateway.
- The reply address in the mail account properties is
different than that of your Internet Service Provider.
RESOLUTION This problem affects all messaging clients, regardless of
manufacturer.
Customers should contact their ISP for assistance since
this problem is not caused by the e-mail client. From a messaging client
standpoint, there are no solutions for customers who have ISP's that block all
SMTP Relay traffic.
Most of the new SMTP e-mail gateway software can
allow relaying for specific IP addresses. This is how cable modem and ADSL
users will be able to continue to use their same ISP. The cable modem or ADSL
provider must provide the customer a static IP address, in turn, the customer's
e-mail ISP will allow relaying for that specific IP address. Banks of IP
addresses can also be allowed which may provide a workaround for some corporate
customers who access ISP's through their corporate LAN.
If the error
is random, it is possible that your SMTP server is checking whether the domain
or the recipient name actually exists before sending. If the recipient's mail
server is temporarily down or unavailable for another reason, such as high
network volume, your SMTP server cannot verify the address and may reject the
relay. In this case, no action is required. The message will be sent when the
receiving server is again available.
Modification Type: | Minor | Last Reviewed: | 8/11/2004 |
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Keywords: | kbsendmail kbemail kberrmsg kbprb KB214402 |
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