Can I reply to email or send new mail?

Not at the moment. This service is receive-only for now: you can read messages, download attachments, and receive verification mail — but replying or sending new mail isn't available yet.

Why receiving comes first

Nearly every temp-mail job — verification codes, download links, confirmation mail — is inbound. Outbound sending is a different category of problem: it's what spammers want, so send-enabled services have to police abuse heavily, and receiving domains get blocklisted faster. Staying receive-only keeps delivery reliable for the job the tool actually does.

Will replying be added later?

Possibly — outbound reply is a natural future feature, and when it's enabled a “Reply” button will appear directly under the message. Until then, if a task genuinely requires sending from the address, a temp inbox is the wrong tool; use a real mailbox.

One thing that will never change: unsolicited bulk sending is prohibited, whether or not outbound reply lands. See the terms of service.