How much can I store? The free tier includes 1 GB; the paid plan includes 10 GB. When you approach your limit, senders receive a temporary "try again later" rather than losing mail outright — but keep headroom.
Are there sending limits? Yes — 100 messages per hour per mailbox. MailHow is for correspondence, not newsletters or bulk sending.
Can I leave? Any time. Download everything as one standard .mbox file (Settings → Account → Export your mail), point your MX records elsewhere, and close the account from the same page. Your domains were always yours.
Why did my message go to spam at the recipient? Check the domain page shows all records verified. New domains with no sending history warm up over days — consistent, wanted mail fixes this quickly.