With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccapAppIntfSMTPTable
Cisco Call Applications Application Interface SMTP Table
1.3.6.1.4.1.9.9.146.1.6.20
Information about last N most active SMTP unique servers accessed from a call application gateway. When applicaiton gateway instances access an external SMTP server, a record entry is created for that server. If a maximum number of server record has reached, then the oldest accessed server record is purged. Maximum number of server records to retain is configured through IOS CLI.
Back to CISCO-CALL-APPLICATION-MIB MIB page.
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