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# SMTP: Err Msg: SMTP_recv:protocol error

Article ID: 100704

Article Last Modified on 10/30/2006

APPLIES TO

- Microsoft Mail Gateway to SMTP 2.1
- Microsoft Mail Gateway to SMTP 3.0

This article was previously published under Q100704

## SYMPTOMS

Versions 2.1 and 3.0 of Microsoft Mail Gateway to SMTP may display this error message:
SMTP_recv: protocol error

## CAUSE

This indicates an error at the TCP or IP layer.

## RESOLUTION

Send the message again. If the error occurs frequently, check the network with a protocol analyzer to determine the exact problem.

Additional query words: 2.10 3.00 errmsg alert

Keywords: KB100704