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Help / WLanguage / WLanguage functions / Communication / Managing emails
  • Timeout
  • Connection with two-factor authentication
  • Required application feature
  • Gmail: What to do if a connection to Gmail (SMTP, IMAP, POP3) fails with a certificate error?
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Stored procedures
Starts a session for receiving and reading emails with the IMAP protocol. You will only be able to read the emails. You have the ability to start a secure IMAP session via SSL.
Remark: To start a session for sending emails, use EmailStartSMTPSession.
// Lecture d'un email par le protocole IMAP
IF EmailStartIMAPSession(SAI_USER, SAI_PASSWORD, "") = True THEN
Error("Impossible d'établir la connexion")
<Result> = EmailStartIMAPSession(<Username> , <Password> , <Server address> [, <Port> [, <Option>]])
<Result>: Boolean
  • True if the session was started,
  • False otherwise. To get the details of the error, use ErrorInfo.
<Username>: Character string
Username on the server. This name is supplied by the service provider or by the network administrator. This name will be used to identify the email session in the different functions for email management.
<Password>: Character string
User password. This password is given by the service provider or by the network administrator.
<Server address>: Character string
Address of email server (incoming protocol). This address is supplied by the service provider or by the network administrator. This address can be given in the following format:
  • IP address in XXX.XXX.XXX.XXX format ( for example).
  • IP address containing the server name ( for example). This syntax is recommended.
  • IP address returned by NetIPAddress.
Remark: The address must be a IPv4 address.
<Port>: Optional integer
Identifies the port used for the IMAP protocol (143 by default).
<Option>: Optional Integer constant
Used to specify whether an SSL connection is required:
(Default value)
Non-secure connection.
optionSSLSSL connection required (for a secured IMAP server).
Remark: In most cases, the port used for a secured IMAP server is port 993 (instead of port 143, the default port value).
Universal Windows 10 App This constant is not available.


The timeout can be set using EmailSetTimeOut.

Connection with two-factor authentication

More and more providers offer secure email accounts (SMTP/IMAP) with two-factor authentication.
Here is how it works:
  • Connect to the email provider using OAuth: this connection provides a token.
  • Use the token to connect to IMAP or SMTP email boxes.
Let's see an example of code that can be used:
// Example of IMAP connection with a Gmail account
// and two-factor authentication
OAuthGoogleCnt is OAuth2Parameters
gMyIMAPSession is emailIMAPSession
// IMAP server parameters
gMyIMAPSession.ServerAddress = ""
gMyIMAPSession.Option = optionTLS
MyIMAPSession.Port = "993"
// OAuth connection parameters
OAuthGoogleCnt.ClientID = "Application ID"
OAuthGoogleCnt.ClientSecret = "Secret application ID"
OAuthGoogleCnt.AuthURL = ""
OAuthGoogleCnt.TokenURL = ""
OAuthGoogleCnt.Scope = ""
OAuthGoogleCnt.RedirectionURL = "http://localhost:9000"
OAuthGoogleCnt.ResponseType = "code"
// OAuth authentication
gMyIMAPSession.AuthToken = AuthIdentify(OAuthGoogleCnt)
// If the authentication was successful, log in to email inbox.
IF gMyIMAPSession.AuthToken <> Null THEN
// prefix syntax of EmailStartSession
IF gMyIMAPSession.StartSession() THEN
// Session started
// Error starting the session.
// Authentication error.
Universal Windows 10 App

Required application feature

When this function is used, an application feature is declared in the application generation wizard.
Required feature: Family and corporate networks
This feature allows the applications to use incoming and outgoing accesses to the family and corporate networks.

Gmail: What to do if a connection to Gmail (SMTP, IMAP, POP3) fails with a certificate error?

Since August 2017, a new certificate was deployed by Google: Google Internet Authority G3. Unfortunately, the Windows API for checking certificates does not validate this certificate.
Therefore, starting a POP3, IMAP or SMTP session may fail with the error "The certificate string was not issued by a trusted authority".
To validate the certificate, all you have to do is modify the management mode of emails. The WLanguage EmailConfigure function allows you to change this mode and to no longer use the Windows API that locks this certificate. The following code must be added before starting the session via EmailStartIMAPSession:
// Enable the multi-platform implementation
EmailConfigure(emailParameterMode, 1)
Remark: From version 23 Update 1, the call to EmailConfigure is not required anymore: WLanguage is automatically using the management mode of emails adapted to the session.
Component: wd280com.dll
Minimum version required
  • Version 15
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Last update: 06/29/2023

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