Limits
Two of the numbers here catch people out: the sending limit for the first 30 days, and the fact that pooled storage is billed rather than enforced.
Ceilings
| Limit | Value |
|---|---|
| Mailboxes per domain | 1,000 |
| Aliases per domain | 5,000 |
| Filters per mailbox | 50 |
These are abuse ceilings, not billing tiers. Nothing between one mailbox and a thousand costs more.
Storage
The domain's 10 GB is pooled: every mailbox draws on the same figure, and mailboxes have no individual quota.
Passing 10 GB does not stop delivery. Mail keeps arriving and the extra storage is billed by the gigabyte-month. That is deliberate, because a mailbox that silently bounces mail is worse than an invoice, but it does mean a runaway mailbox costs money rather than raising an error. Current usage is on the Domain Settings tab.
Sending
Two separate limits apply to outgoing mail, and they measure different things.
A rate limit per mailbox, which is about bursts:
| Period | Messages |
|---|---|
| Per hour | 200 |
| Per day | 2,000 |
A monthly volume per domain, which is about the bill: 1,000 outbound messages are included, and everything beyond that is charged per message. Going over does not stop you sending.
The first 30 days are stricter
For 30 days from the day your customer account was registered, not the day the domain was set up, each mailbox is held to:
| Period | Messages |
|---|---|
| Per hour | 30 |
| Per day | 100 |
This exists to keep freshly registered accounts from being used to send spam.
Nothing is lost when you hit it. The message is temporarily refused at the SMTP level and stays in your mail client, which retries on its own in most cases. If yours does not, send it again later.
The restriction lifts by itself on day 31 with no action from you. The Email page shows how many days are left. If you are migrating existing mailboxes and cannot wait, Request an early lift there and say why; a member of staff reviews it.
Message size
The server accepts messages up to 100 MiB, and advertises that limit to your client when it connects.
That is the size of the whole message, not of the file you attached. Mail encodes attachments in a form that is roughly a third larger than the original, so the practical ceiling for a single attachment is closer to 70 MB. A message over the limit is refused at submission, so your client tells you immediately rather than the mail vanishing.
Receiving mail servers set their own limits, and many are far lower. A message this platform accepts can still be rejected by the recipient's provider, which is a bounce rather than a failure here. For anything large, a download link beats an attachment.
Spam and viruses
Filtering is server-side and has no customer-facing settings. Sensitivity is fixed, and there is no allow list or block list you can edit.
What happens to a message depends on how bad it looks:
- Suspicious mail is delivered into the Junk folder. Junk is an ordinary IMAP folder, created and subscribed for you, so it shows up in every client.
- Clearly abusive mail is refused during the SMTP conversation and never delivered anywhere. There is no quarantine to release it from.
- Infected mail is refused the same way. Inbound mail is virus-scanned.
If you want your own rules on top of that, use the Sieve filters on a mailbox.
Check Junk before reporting a lost message
A message filed as Junk was accepted and delivered, and it is sitting in the folder. A message refused at SMTP level was never accepted, and the sender got a bounce saying so. Those are different problems and the sender's bounce tells you which one you have.
Backups
Every email hosting product includes daily, weekly and monthly backups of email data, kept for up to 6 months.
Restores are requested, not self-served: open a support request from the portal and it is carried out for you. There is no restore button.
This does not replace your own copies
A platform backup is a floor. It is there for the day something goes wrong on our side, not as your archive, and a restore is a manual operation with a turnaround rather than an instant one. Keep your own copies of mail you cannot afford to lose.
What's next
- Troubleshooting for what a specific rejection means
- Mailboxes and aliases for filters and vacation replies