HexValidEmail version history  2005-05-10

Fixed incorrect address rejections in certain cases of greylisting.  2004-04-26

Added option (hexVeOptionDontSendNoopComments) to turn off NOOP comments during the SMTP session.

1.4  2004-03-24

Created the hexVeErrBogusMxRecords error to indicate that the MX records for a domain don't have valid IP addresses.

Created the hexVeSenderBlocked error to indicate that the SMTP server is not accepting email because of the user's IP address, email address, HELO domain, or some other reason.

Added ability to check for SMTP servers that accept all addresses and do not reject bad ones. Simply add the new hexVeOptionTestForCatchAll constant to Options. Validations against such servers will set Error to hexVeErrDetectedCatchAll. When you see this error, avoid wasting your time on SMTP validations for email addresses at that domain.

Improved SMTP rejection error detection.

Fixed minor bug that resulted in occasional hexVeErrUnexpected errors at the SMTP level.

Fixed bug that occasionally resulted in truncated SmtpSession text.

Corrected DNS check so that it sets Error to hexVeErrNoMxForDomain when the email address has a domain literal and Options contains hexVeOptionRequireMx.

Corrected the license check so that it retains the license information in the case of a hexVeErrUnlicensedProcessors error.

Improved the DNS retry algorithm.  2004-02-17

Changed SMTP validation to try next server (instead of just exiting) upon unexpected socket error.  2003-09-18

Added workaround for VeriSign's DNS breakage for .com and .net domains.

1.3  2003-01-22

Refined the DNS retry algorithm.

Changed the threading model to "Both" to make usage from .NET more flexible. The component can now work in both single-threaded apartments and multi-threaded apartments.

If you are upgrading to this version, you will need to re-register the DLL by running the installation program or using RegSvr32. Windows 95 users will need to have Internet Explorer 4 or later installed for the DCOM update it provides. You do not have to make any changes to your code.  2002-10-08

Fixed buffer overread when checking short, invalid runtime keys. This problem showed up only occasionally for users of languages that require direct use of IClassFactory2 (i.e., C++, Delphi).  2002-05-13

Removed a bit of debugging code that was inadvertently left in the release build. The debugging code puts entries in the Windows Event Log but does not otherwise affect functionality.

1.2  2002-05-09

Significantly improved bad address detection by recognizing numerous additional error conditions in the SMTP session.

Refined the SMTP algorithms and command sequence.

Created a new error value, hexVeErrorMailboxFull, to indicate that the mailbox for the specified address is out of space. HexValidEmail now recognizes the mailbox full condition and returns this error.

Added a registry key for specifying local nameserver addresses.  More information...

Added NOOP comments to the SMTP session to give mail server administrators helpful information in case they have questions about the session. The comments include a secure hash (SHA1) of your license information, if any. This does not reveal your identity to admins or allow Hexillion to track your validations. (HexValidEmail never "phones home".) Rather, it facilitates communication in case of a problem. If an admin has concerns about your session, he can send us the hash. We can compare it to hash values in our database, figure out whose license it is, and pass the concerns on to you. 
Info about polite usage...

Fixed an address parsing bug that allowed periods at either end of an address' local part.

Fixed a problem in which Validate would return a "domain does not exist" error when in fact an A record lookup on the domain had returned some other error.

Fixed a problem with instantiating HexValidEmail in MTS and COM+ packages. These environments do not support the IClassFactory2 licensing interface, so HexValidEmail now falls back to using the regular IClassFactory::CreateInstance method to create the instance of HexDns it needs. Because HexValidEmail cannot use its runtime key for HexDns in MTS/COM+ packages, you will need a separate license for HexDns in these environments.

Improved license-checking code in several ways. The most visible consequence is that the component will pick up license file changes without requiring an IIS restart.

Added an anti-abuse clause to the license agreement.  2002-02-25

Fixed bug that caused the Validate method to continually retry MX record lookups if the lookups failed with a non-authoritative host-not-found.

1.1.11  2000-06-12

Improved runtime key handling. Now VB programs can be compiled with early binding during the evaluation period. (Before, VB would generate a "Permission denied" error. The workaround was to use late binding during evaluation.) After obtaining a license file, you will need to recompile VB programs in the presence of the license file so VB can embed a permanent runtime key (thereby allowing distribution without the license file).

1.1  2000-03-04

  • Fixed a bug in SMTP validation that caused Validate to block well beyond the timeout period if all mail servers for the domain refused connection.
  • Refined the SMTP validation algorithm considerably, making it "try harder" to contact a working mail server.
  • Changed the use of VRFY and EXPN during SMTP validation to an option specified by hexVeOptionTryVrfyAndExpn in Options. The use of these commands does not affect validation outcome and may raise flags for server administrators.

1.0  2000-02-19

Includes various tweaks and corrections.

1.0 beta 1  2000-01-25

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