B4X

Get the IMAP Server Capabilities

Demonstrates the Chilkat Imap.Capability method, which sends the IMAP CAPABILITY command and returns the server's raw capability response. This example connects and prints the capability list. Use HasCapability to test for a specific one.

Background: Not all IMAP servers support the same features. The CAPABILITY response is the server's advertised menu — a space-separated list of extensions such as IDLE (push notifications of new mail), MOVE, UIDPLUS, QUOTA, and the supported AUTH= mechanisms. A well-behaved client checks capabilities before relying on an optional feature, falling back gracefully when it is absent.

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Dim success As Boolean = False

'  Demonstrates the Imap.Capability method, which sends the IMAP CAPABILITY command and
'  returns the server's raw capability response.

Dim imap As ChilkatImap
imap.Initialize("imap")

imap.Ssl = True
imap.Port = 993

success = imap.Connect("imap.example.com")
If success = False Then
    Log(imap.LastErrorText)
    Return
End If


'  Ask the server for its capability list.
Dim capabilities As String = imap.Capability
If imap.LastMethodSuccess = False Then
    Log(imap.LastErrorText)
    Return
End If

Log("Server capabilities: " & capabilities)

'  Sample output:
'  
'    Server capabilities: * CAPABILITY IMAP4rev1 LOGIN-REFERRALS ID ENABLE IDLE SASL-IR LITERAL+ AUTH=PLAIN AUTH=LOGIN
'    aaab OK Pre-login capabilities listed, post-login capabilities have more.

success = imap.Disconnect
If success = False Then
    Log(imap.LastErrorText)
    Return
End If