Symptoms
An SMTP monitor does not handle all multi-line banner use cases, such as when the banner is physically split across two packets.
This issue is due to attempting to parse the banner value from the first packet without a portion of the banner value that may arrive in a second packet.
Impact
The SMTP monitor sends an RST after the first packet, and marks the resource down.
Conditions
An SMTP monitor is configured; and uses a multi-line banner; and the SMTP monitor banner is split across two physical packets.
Workaround
Use an SMTP monitor with a single-line banner.
Or, rather than using an SMTP monitor, instead use a TCP monitor with send/recv strings.
Fix Information
An SMTP monitor handles all use cases that include a multi-line banner.
