Email as tickets
A connected mailbox turns emails into tickets in the inbox.

ChannelsSettings → Email connects a mailbox. Incoming email becomes a ticket under Inbox → Tickets with its own folders, and replies go out as email from the same address. Until a mailbox is connected the Tickets folders stay empty and the dashboard says “Arrives with the mailbox”.
Sending from your own domain
Settings → Email → your own domain: add the domain, then the records it shows at your DNS host. Among them are three marked “Newsletter signature (DKIM)”: they let your newsletters and automations go out through doTask’s newsletter service, which keeps each business’s sending reputation separate, so another business’s bad list never affects yours. Your address works for replies as soon as the first records are found; newsletters move over once those three are found too. The page checks on its own every twenty seconds.