Use the web inbox
Read, search, organize, compose, and reply from Startup Mail’s focused mail surface.
Use the combined inbox
Choose Combined inbox in the mailbox selector to triage all mailboxes you can access on one screen. Every conversation shows the original delivered-to address, so messages sent to support@product-a.com remain distinguishable from messages sent to billing@product-c.com. Opening a conversation keeps its owning mailbox intact, and replies send from that mailbox’s address.
Switch mailboxes
Use the mailbox selector in the left navigation to move between individual addresses you can access. Shared and private mailboxes are marked separately. Unread counts belong to each mailbox.
Work with conversations
Messages are grouped into threads. Opening a thread marks it read and shows the complete conversation in chronological order. Inbox, Starred, Sent, Archive, Spam, and Trash are separate views. Archived conversations can return to Inbox. Trashed conversations can be restored for 30 days before permanent removal.
Search runs on the server across accessible senders, recipients, subjects, snippets, and plain-text message content. Older results load in pages. Compose suggests people you contacted recently without requiring a separate contacts database.
Compose and reply
Choose Compose, select an available sending mailbox, enter up to ten recipients in each recipient field, add a subject, and write plain or formatted content. Replies keep the existing thread relationship. You can drop files anywhere in the composer, or paste and drop images directly into the message.
Attachments are uploaded before the message is queued. A single attachment can be up to 5 MB, a message can contain up to ten attachments, and the entire message must stay under the configured 10 MB boundary.
Reply uses the sender's Reply-To address when one is present. Reply all excludes the current inbox and keeps the other original recipients on CC. Forward includes the original message's downloadable attachments. Each person can configure a separate plain-text signature for every address they can send from. Open Email signatures from the account menu. The signature is shown before send and added to new messages, replies, and forwards from that address.
Delivery status
An outgoing message first appears as queued. Provider feedback can move it to sent, delivered, or failed. A failed status is about that message delivery; repeated hard bounces or complaints can also suppress a recipient or pause workspace sending.
Messages rejected by provider safety checks, attachment limits, or the workspace storage ceiling produce a dismissible inbox notice. Their unsafe content is not stored.