Delphi DLL

Get the Size of a POP3 Message by UIDL

Demonstrates the Chilkat MailMan.GetSizeByUidl method, which returns the size, in bytes, of the email on the POP3 server identified by a UIDL. The size includes the full message content, including attachments, and the method returns -1 on error. This example looks up a message's size by its UIDL.

Background: A UIDL ("unique ID listing") is POP3's stable identifier for a message — it stays the same across sessions as long as the message remains in the mailbox. Checking a message's size before downloading lets a client skip or defer very large messages, enforce size limits, or show a progress estimate. You can obtain the available UIDLs from GetMailboxInfoXml or FetchUidls.

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Delphi DLL

var
mailman: HCkMailMan;
sizeBytes: Integer;

begin
//  Demonstrates the MailMan.GetSizeByUidl method, which returns the size, in bytes, of the
//  email on the POP3 server identified by a UIDL.  The size includes the full message
//  content, including attachments.  Returns -1 on error.

mailman := CkMailMan_Create();

//  Configure the POP3 server connection.
CkMailMan_putMailHost(mailman,'pop.example.com');
CkMailMan_putMailPort(mailman,995);
CkMailMan_putPopSsl(mailman,True);
CkMailMan_putPopUsername(mailman,'user@example.com');
CkMailMan_putPopPassword(mailman,'myPassword');

//  Get the size of a specific message by its UIDL.
sizeBytes := CkMailMan_GetSizeByUidl(mailman,'0000000123abcdef');
Memo1.Lines.Add('Message size (bytes): ' + IntToStr(sizeBytes));

//  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
//  connects and authenticates -- using the property settings above -- whenever a server
//  operation requires it.  Calling the explicit connect/authenticate methods can still be
//  helpful to determine whether a failure occurs while connecting or while authenticating.

CkMailMan_Dispose(mailman);