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550 email rejected

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5 replies

by mc428

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Problem with outgoing mail to only one particular company.

E-mail coming back says:

The following recipient(s) could not be reached:

'name@othercompany.com' on 12/14/2001 11:52 AM

Unable to deliver the message due to a communications failure

The MTS-ID of the original message is: c=US;a= ;p=site;l=server-011214195216Z-8430
MSEXCH:IMS:sitename:sitename:server 3550 (000B09AA) 550 email rejected

E-mail to name@othercompany.com is rejected regardless of who the internal sender is. But e-mail is received successfully from the the other company. I checked Exchange and user settings, no restrictions applied. I've asked the user of the other company to check with their IS guys to see if any restrictions applied -- None.

Previous to this month, e-mail was successful sent to and back from this company.

This is the only company that we are unable to send e-mail to. Is there another setting i've missed?

5 replies

by ann777

MSKB Q195969
make sure you read to the end of the article above.

550 errors have to do with "mail relay" --

by rlevesque

something else to check.

They may be subscribing to a filter service which blocks (or maybe their own ISP does it) IP addresses of known smtp relays that are open, which allow for spamming.

They may have blocked your IP or their ISP may have done it without the company knowing it was done.

just a thought... good luck!

by mc428

Thanks...turns out their ISP blocked any mail from our ISP's domain due to past spamming

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