On Wed, Apr 20, 2022 at 09:51:18PM +0800, Turritopsis Dohrnii Teo En Ming wrote: > I believe Gmail is using IMAP. The instructions for configuring Gmail > email accounts in Outlook specifically mention IMAP server hostname: > > imap.gmail.com > > TCP Port 993, SSL
Gmail offers an IMAP2 endpoint so that users can connect to Gmail with IMAP2 clients (Thunderbird, Claws, Apple's Mail.app, or whatever) if they wish to. However, Gmail's web interface, and Gmail's proprietary mobile apps, almost certainly do *not* use IMAP2 to communicate with the Gmail servers. As has already been pointed out in this thread, they likely use a proprietary protocol optimised for that proprietary environment. Sam
