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T.37 Option Guide: English 97
Network Administrator
Service Codes
When a communication error occurs, print the Activity
Report. Use the report to find the service code for the error.
There are two types of service codes.
· SMTP
· POP3
SMTP Error Codes
Here is the format for SMTP communication service codes.
E123
E = SMTP communication
123 = three-digit SMTP error code defined by RFC.
RFC is an Internet “standards” term meaning “Request
For Comment”. RFCs are documents that define
standards or proposed standard-definitions for network
and Internet operation. Individual RFCs define specific
aspects of network or Internet operation.
Numbers 900 and above are codes defined specifically for
this Internet Fax.