postARK

Email continuity for Microsoft 365

Your email, kept safe when Microsoft 365 isn't.

postARK receives every email sent to your domain, keeps an untouched copy, and passes it straight on to Microsoft 365. If 365 has an outage, your team signs in with a one-time code and keeps reading new mail.

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  • Delivered to 365 in seconds
  • Stored in London, UK
  • One connector, no mailbox changes
  1. Email arrivesSent to anyone@yourcompany.co.uk
  2. postARK keeps a copyByte for byte, before saying “received”
  3. Handed to Microsoft 365Lands in Outlook as normal
  4. 365 down?Read it at postARK, retried until 365 takes it

How it works

postARK sits in front of Microsoft 365 as the first stop for your inbound mail. Nothing changes for your staff on a normal day.

1

Point your MX at postARK

We set up your domain, check each mailbox against your 365 directory, and help you change one DNS record when you are ready to go live.

2

Every email is kept

Each message is stored exactly as it arrived, then delivered to 365. Mail for addresses that don't exist is turned away at the door.

3

Outage? Keep reading

Staff sign in with their email address and a one-time code sent by SMS. They see their own mail only, and can download any message.

4

Nothing is lost

While 365 is unavailable, postARK keeps trying. When it comes back, every waiting email is delivered automatically.

For businesses

When Outlook stops, your inbox doesn't.

Microsoft 365 is reliable, but when it has a bad day, so do you: orders, invoices and customer emails go unseen. postARK means the email still arrives somewhere you can read it.

  • Read new mail on any phone or laptop during an outage
  • Sign in with a one-time code by SMS; no new passwords
  • Each person only ever sees their own mailbox
  • Download the original message to forward or keep
  • Copies are deleted automatically after your retention period

What postARK is not

We'd rather you know up front.

  • Not a spam filter. Microsoft 365 keeps doing your filtering, as it does today.
  • Not for sending. Outgoing mail still goes through 365.
  • Not a replacement for backup. It covers new mail during an outage, not your mailbox history.

Built for running many customers

  • One admin console for every customer and domain
  • Guided onboarding with live MX and directory checks
  • Live delivery log: every email, every step, to the 365 accept
  • Queue view with release and retry
  • Per-domain retention and a full audit trail
  • Manager logins scoped to their own customers

For IT partners and MSPs

Offer email continuity without running mail servers.

Add postARK to your Microsoft 365 customers in minutes. Setup adds one inbound connector to the customer's tenant; directory checks use read-only Microsoft Graph access, so mailboxes and users are never changed. You keep the relationship; we run the platform.

Become a partner

Pricing

One price, everything included. Whether you're one company or an IT provider covering many.

£1.50 per mailbox / month

Every feature, for every customer. No tiers. Minimum 10 mailboxes (£15 a month).

Get started
  • Every inbound email kept and delivered to 365
  • Outage access with one-time codes
  • 30-day retention as standard, adjustable per domain
  • Multi-customer admin console for IT partners
  • Manager logins, delivery log, queue and audit tools

Minimum 10 mailboxes per customer. Prices exclude VAT.

Questions

Does anything change in Microsoft 365?

Yes, two things. We add one inbound connector to your tenant so Microsoft 365 recognises mail from postARK as trusted, and you change your MX record so mail reaches postARK first. Mailboxes, users and your other settings are not touched, and checking your mailbox list uses read-only access.

Will emails be delayed?

No. Mail is handed to Microsoft 365 as soon as the copy is stored, normally within a second or two.

Who can read the stored copies?

Only the mailbox owner, after signing in with a one-time code sent by SMS to their registered mobile. Every sign-in and admin action is recorded.

How long do you keep my email?

30 days by default, then it is deleted automatically. Your provider can set a different period per domain.

Where is my email stored?

On servers in London, UK.

Talk to us

Tell us how many mailboxes you'd like covered, or ask us anything.

ark@mspcyber.uk

Already a customer and 365 is down? Read your mail here.