To function at its peak, PerfectMail needs to know the e-mail addresses of the users it is protecting. There are many ways of determining which recipients are valid, such as: Static Lists of valid e-mail addresses. This is called List Validation and is supported in PerfectMail through Domain Admin → Valid Addresses. Query Active Directory (or some other directory service such as LDAP).

SMTP Validation works by opening an e-mail connection to the protected mail server. Using the newly open connection, PerfectMail announces itself to the mail server, declares its intention to send mail to the target recipient and then checks the return code for that recipient. PerfectMail then records the success or fail code for the recipient in question. It is easy to query a mail server to see if a recipient is valid.

HexValidEmail provides an option for sending VRFY and EXPN so you can see the results with the SmtpSession property. HexValidEmail ignores these results, however, and only considers the response to the RCPT command. Occasionally you will see cases in which the responses disagree. HexValidEmail does not use VRFY and EXPN because they have become quite unreliable as tests in recent years.

SMTP (Simple Mail Transfer Protocol) is the method that mail servers use to communicate. The usual method of sending mail is your mail client will contact the given SMTP server which looks up the MX record for the destination domain then transports the mail to the destination. If the destination denies this mail it sends a bounce message to the sender, in this case the address in the 'from' field of the mail. Attention: SMTP does not work for AOL or Wanadoo customers.

Validation is the process whereby a programme of study designed to lead to an Open University validated award is judged by a group of external peers to have met the principles and requirements for that award. Open University validated awards must be consistent and comparable in standard with awards throughout higher education in the UK, and the peer review system employed by OUVS is designed to ensure this.

Yes, all three are included with every account. Note that SMTP requires access to port 25 and that some ISPs block access to port 25 which would prevent you from using your SMTP erver via your mail program.

Question: I installed version 1.1 of the MTA but now some mail messages are coming in as a file attachment with an attachment name of "att1.unk". Answer: The reason is that some mailers inappropriately send messages with a Content-Type of "Plain/Text" (Netscape is the most frequently used mailer that does this) but without a Content-Name; plain text messages should not be specified with this MIME Content-Type attribute. If you want to go back to the way SMTP 1.

The word therapy has different meanings in different countries and languages. Validation is not a therapy in the sense that it does not heal the client or 'make them better'. In Validation, the person is accepted just as he or she is in the moment. In some cultures the word 'therapy' is used more freely and is associated with any method that has benefits for the 'user'. Validation was begun in the United States where this is true and for many years Validation was known as a 'therapy'.

The use of UV technology for drinking water disinfection does come with limitations. In order for a particular system to be used for the treatment of drinking water, in regulated applications, it must have proof of performance. Proof of performance can be described as third party validation. This type of validation requires a third party expert to witness a bioassay test on the UV system in question, according to a specific UV testing protocol.