DropMail.me

DropMail.me is a disposable-email service with an unusually generous feature set for a free product, and its Telegram bot exposes most of it. Tap Start for an instant random address; unlike many competitors that force a hard 10-minute expiry, DropMail lets the mailbox stay valid indefinitely as long as you keep interacting with it, with shorter fixed options (10 minutes, 2 hours) available if you want the address to self-destruct on a schedule.

Beyond the basics, DropMail supports attachments, forwarding incoming mail to a real address, and a documented API for people who want to generate and read disposable inboxes programmatically — handy for QA and testing pipelines, not just one-off sign-ups. According to its public Telegram profile it has around 32,600 monthly users, a solid number for this category, and the underlying service publishes a privacy policy and accepts crypto donations rather than running on ads, which is a more transparent business model than most.

The trade-off is the same as any temp-mail service: the operator can technically read whatever passes through the mailbox, so it's for throwaway sign-ups and testing, not for password resets, banking, or anything you'll need to recover later. Within that limitation, it's one of the stronger free options in this list.