EmailCheckAddress (Function)

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Email address to check

Validation by server: Necessary conditions

List of TLDs used during a string syntactic validation

Related examples

See also

EmailCheckAddress (Function)

In french: EmailVérifieAdresse

Checks the validity of an email address.

Versions 17 and later

This function is now available for iPhone/iPad applications.

New in version 17

This function is now available for iPhone/iPad applications.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Versions 22 and later

This function is now available in Android Widget mode.

This function is now available for Android applications.

New in version 22

This function is now available in Android Widget mode.

This function is now available for Android applications.

This function is now available in Android Widget mode.

This function is now available for Android applications.

Example

IF EmailCheckAddress("morgan@test.com", emailValidateSyntax) <> emailAddressValid THEN
Error("Please check the email address")
END

SWITCH EmailCheckAddress("azerty@orange.com")
CASE emailAddressValid
Info("Valid address")
CASE emailAddressIncorrectSyntax
Info("The syntax of the address is incorrect.")
CASE emailAddressRefused
Info("The address was refused by the email server." + ...
"ErrorInfo returns the reason for the refusal.")
CASE emailAddressError
Info("An error occurred during the check. " + ...
"ErrorInfo returns the details of the error.")
OTHER CASE
Info("Undefined case")
END

Syntax

<Result> = EmailCheckAddress(<Address> [, <Validation level>])

<Result>: Integer constant

Constant used to find out whether the address passed in parameter is valid:
emailAddressError An error occurred during the check. ErrorInfo returns the error details.
emailAddressRefused The address was refused by the email server. ErrorInfo returns the reason for the refusal.
emailAddressIncorrectSyntax The syntax of address is incorrect.
emailAddressValid The address is valid. This address can be used by EmailSendMessage.
Remark: A time-out may be required according the response time of the server.

<Address>: Character string (with quotes)

Email address to check.

<Validation level>: Optional integer constant

Requested type of validation. You have the ability to use one of the following constants:
emailValidateByServer Checks whether the SMTP email server of the domain to which the address belongs accepts the address in input. The syntax of the email address is automatically checked (emailValidateSyntax constant).
This constant is not available.
emailValidateSyntax
(Default value) Checks the syntax of the email address. The TLD (Top Level Domain) is not checked.
emailValidateSyntaxStrict Checks the syntax of the email address as well as the TLD (Top Level Domain) in relation to the list of existing TLDs (see Notes).

Remarks

Email address to check

Although email addresses with the format "@[domain name].tld" have a valid syntax according to the RFC822 standard, they are not supported by EmailCheckAddress.
If the <Validation level> corresponds to the emailValidateSyntax constant, the email address can contain an empty TLD ("doe@domain." for example).
If the <Validation level> corresponds to the emailValidateByServer or emailValidateSyntaxStrict constant, the email address cannot contain any empty TLD ("vince@domain." for example). In this case, <Result> corresponds to emailAddressIncorrectSyntax.

Validation by server: Necessary conditions

To use the validation by server (emailValidateByServer constant), the application must be able to contact:

a DNS server (by UDP on port 53),
the email server of the domain to which the address to check belongs (by TCP, port 25).

Therefore, the firewalls may have to be configured specifically.

Caution: In some cases, an email server may accept a non-existing address (when the server is a relay server that cannot access the list of accounts of the domain for which the emails are collected). In this case, <Result> will correspond to the emailAddressValid constant even if the address does not exist. Furthermore, the time for retrieving the sever response can be quite long.

Remark: The interrogated SMTP email server is found by the MX record (Mail Exchanger) of the domain of the email address.

List of TLDs used during a string syntactic validation

When performing a strict syntactic check (emailValidateSyntaxStrict constant), a list of international and national TLDs is used.

Versions 22 and later
The list of TLDs was updated with the official IANA list (Internet Assigned Numbers Authority) dated May 2017.
Remark: The available TLDs may have changed since this update.

New in version 22
The list of TLDs was updated with the official IANA list (Internet Assigned Numbers Authority) dated May 2017.
Remark: The available TLDs may have changed since this update.

The list of TLDs was updated with the official IANA list (Internet Assigned Numbers Authority) dated May 2017.
Remark: The available TLDs may have changed since this update.

Related Examples:

Complete examples (WINDEV): WD Mail

[ + ] This application is an email client developed in WINDEV. It is based on the Email objects.
This email client is used to retrieve and send emails by using the POP, IMAP and SMTP protocols.
You have the ability to apply filters to the incoming emails.

The application can also be used to manage several email accounts. The writing of an email is based on the HTML edit control.

Component : wd250com.dll