CONTACT:
Eric Wilde
BSM Development
44 Whitewood Circle
Norwood, MA 02062
Phone: 781-551-0153x600
Web: http://www.bsmdevelopment.com
Email: info@bsmdevelopment.com
SMTP Redirector Supports Multiple AUTH Mechanisms and Enhanced Error Recovery
Norwood, MA -- March 21, 2015 -- BSM Development (www.bsmdevelopment.com) announces that the latest version of their SMTP Redirector now supports sender authentication through the ESMTP AUTH verb, using many of the mechanisms supported by this verb, viz. PLAIN, LOGIN, CRAM-MD5, DIGEST-MD5 and the various GSSAPI mechanisms such as Kerberos. The AUTH mechanism to be used for authentication is chosen based on the mechanisms supported by the remote MTA. The most secure and robust mechanism that is provided by the remote MTA is automatically chosen, provided that the appropriate cryptographic libraries are installed on the client system. The redirector will fall back to the lesser mechanisms until authorization is achieved, thereby using the strongest mechanism that works.
The SMTP redirector is typically used by on sendmail-based systems to deliver email in situations where the client system cannot connect directly to a remote MTA for mail relaying. It works by redirecting all of the outbound mail sent by sendmail, through a single mail user's account on the remote system. Thus, even if the client system is behind a wall that prevents outbound mail relaying, or is operating under an ISP that does not permit outbound mail relaying, or is running in an environment where all email must be sent through a local MTA, mail can none-the-less be delivered, providing a traditional email account can be set up somewhere.
The SMTP redirector accepts outbound email from sendmail (through a simple change in the sendmail.mc configuration file) and redirects it to a remote MTA, as if it were being sent from an email client, after logging in as a valid email user. To do so under most configurations, it must be supplied with an email userid and password. Before the email is sent, the userid and password is authenticated using the ESMTP AUTH verb. The remote MTA will then deliver it in the normal fashion, as if it were from a regular email client, without any of the usual email relaying problems or concerns, since it is from an authorized user.
In addition to the user authentication changes described above, the latest version of the SMTP redirector employs a more robust message exchange scheme that makes it impervious to communications errors, disconnections, and failures by the remote MTA to respond to the redirector's message delivery requests. This renders it able to recover gracefully from all such problems and more, thereby ensuring that it will continue to reliably deliver email to the remote MTA despite any ensuing problems.
In conjunction with the message queueing model used by sendmail to ensure reliable message delivery, the improved SMTP redirector takes the steps necessary to see that mail is either delivered or placed back in the queue for later delivery, when problems occur, thereby extending the guarantee of best effort email delivery that SMTP and sendmail are known for.
In addition to the Email Redirector, BSM Development also offers the mail handling products MailCorral, SpamCorral and an Email Filter Validation Suite.
MailCorral filters mail delivered to Unix and Linux systems via the standard Simple Mail Transfer Protocol (SMTP) interface, through sendmail, the MTA. It watches all mail traffic entering the system and inspects it for the presence of harmful viruses and annoying spam. It detects and renders harmless the viruses as well as identifying and sidelining the spam. It can forward mail to third-party archivers or it can archive the mail directly, itself in the local file tree. MailCorral contains built-in spam and virus identification routines but can also seamlessly invoke third party spam and virus identifiers such as Spamassassin and ClamAv to classify spam and detect viruses. Several methods of handling messages that contain spam and/or viruses are provided.
SpamCorral sends a notification message to each spam recipient, once a day (or more frequently if you choose), showing them all of the spam that they would have received in the past day and listing its details. The recipient has the option of replying to the notification, to request that specific pieces of spam be remailed to them or ignoring it altogether. The annoyance of dealing with spam is kept to a very short amount of time and only happens once a day. If the recipient ignores the notification, the spam is silently deleted by SpamCorral. In a typical case, the spam recipient spends twenty or thirty seconds a day dealing with all of their received spam, most of which is deleted automatically. However, those one or two important pieces that were accidetally misidentified as spam will not be lost or left to languish in the spam folder.
For more information about these
products, see the company's products Web page,
http://www.bsmdevelopment.com/Products/,
email
info@bsmdevelopment.com
or phone 781-551-0153x600.