Rust

Fetch a Set of POP3 Messages by UIDL

Demonstrates the Chilkat MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are listed in a StringTable and appends them to an EmailBundle. The arguments are the UIDL StringTable, headersOnly, numBodyLines, and the EmailBundle. This example fetches two specific messages by UIDL.

Background: This is the efficient way to download a selected subset of a mailbox in one call — exactly the pattern for an incremental client: list the mailbox UIDLs, compare against the ones you've already stored, and fetch only the new UIDLs as a set. It avoids re-downloading messages you already have while still pulling everything new in a single operation.

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// Demonstrates the MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are
// listed in a StringTable and appends them to an EmailBundle.  The arguments are the UIDL
// StringTable, headersOnly, numBodyLines, and the EmailBundle.  The messages remain on the
// server.

let mailman = chilkat::MailMan::new();

// Configure the POP3 server connection.
mailman.set_mail_host("pop.example.com");
mailman.set_mail_port(995);
mailman.set_pop_ssl(true);
mailman.set_pop_username("user@example.com");
mailman.set_pop_password("myPassword");

// Build the set of UIDLs to fetch.
let uidls = chilkat::StringTable::new();
let _ = uidls.append("0000000123abcdef");
let _ = uidls.append("0000000124abcdef");

// Fetch the listed messages (full bodies) into a bundle.
// headersOnly=false (fetch the entire message).
// Note: numBodyLines only applies when headersOnly is true (it sets how many lines of the
// body to include along with the headers).  When headersOnly is false, the entire message
// is fetched and numBodyLines is ignored.
let bundle = chilkat::EmailBundle::new();

if mailman.fetch_uidl_set(&uidls, false, 0, &bundle).is_err() {
    println!("{}", mailman.last_error_text());
    return;
}

let n = bundle.message_count();
println!("Fetched {} messages.", n);

let email = chilkat::Email::new();
for i in 0..n {
    let _ = bundle.email_at(i, &email).is_ok();
    println!("{}", email.subject());
}

// 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.