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The STARTTLS implementation in the server in Ipswitch IMail 11.03 and earlier does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.
Use CWE-20, Ipswitch vendor hub and Imail product page to widen CVE-2011-1430 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2005-1256, CVE-2005-1255 and CVE-2007-1637 for nearby disclosures in the same product family.