Home / Services / Business email

Business email hosting · Spam & email security filtering

Business email on your own domain, run and supported by us.

Private, managed mail hosting for companies that want their mail under their own name, hosted in a region they choose, and looked after by a team they can reach directly. We set it up, move your existing mail across, filter what comes in, and stay responsible for it afterwards.

How incoming mail reaches your staff

  1. Incoming mailSent to an address on your domain
  2. Sender checksSPF, DKIM and DMARC are verified
  3. Spam & malware filterUnwanted mail stopped, doubtful mail held for review
  4. Your mailboxRead on webmail, desktop and phone

Overview

What you get

Each client gets a mail service configured for their own domain. The list below is what is included as standard; anything specific to your business, such as retention rules or the number of mailboxes, is agreed in the written proposal.

  • Own-domain mailboxesname@yourcompany.com for every member of staff
  • Aliases and shared addressesRole addresses and distribution lists
  • IMAP and SMTPFor the desktop mail apps staff already use
  • WebmailAccess from any browser
  • Phones and tabletsMail on the move
  • Calendar and contacts syncKept in step across devices
  • Spam and malware filteringIncluding phishing and attachment scanning
  • SPF, DKIM, DMARCConfigured for your domain
  • MigrationFrom your current provider
  • BackupsOf mail data, with restores on request
  • Your region, local supportHosting region of your choice

Mailboxes & access

Works with the mail apps your staff already use

Mailboxes use the standard mail protocols, so there is nothing special to install. Staff keep using their existing desktop mail client, the mail app on their phone, or webmail when they are away from their own computer.

Included

  • Addresses in the form name@yourcompany.com, plus aliases and shared mailboxes for roles such as accounts@ or info@
  • IMAP and SMTP over encrypted connections, with connection settings we provide for each device type
  • Webmail for access from any browser
  • Setup help for desktop clients and phones when you move over
  • Adding, removing and renaming mailboxes as staff join and leave

Spam & email security

Filtering before mail reaches the inbox

Incoming mail is checked for spam, phishing and malware before it is delivered. Messages that are clearly unwanted are stopped; doubtful ones are held so that they can be reviewed and released if they turn out to be genuine.

Included

  • Spam and phishing filtering on all incoming mail
  • Scanning of attachments for malware
  • Allow and block lists for senders and domains, adjusted on request
  • Help investigating a message that was blocked or should have been

Filtering can also be set up in front of a mail server you keep running yourself, if you only want this part of the service.

Deliverability

SPF, DKIM and DMARC set up properly

Receiving servers increasingly reject or junk mail from domains without correct sender authentication. We publish and check the DNS records for your domain so that your mail is accepted, and so that others cannot easily send mail pretending to be you.

  • SPF – lists the servers allowed to send mail for your domain
  • DKIM – signs outgoing mail so receivers can verify it was not altered
  • DMARC – tells receivers what to do with mail that fails those checks, and where to send reports

If other systems send mail as your domain, such as an invoicing or newsletter service, we include them in the records so they keep working.

Migration

Moving from your current provider

Moving email is mostly about planning. We agree the order and the timing with you, copy existing mail across, and change the DNS records only when the new mailboxes are ready.

  1. Inventory

    We list the mailboxes, aliases, shared addresses and any systems that send mail for your domain.

  2. Copy

    Existing mail is copied mailbox by mailbox from your current provider while staff keep working as normal.

  3. Switch

    At an agreed time we update the DNS records so new mail arrives at the new service, then copy anything that came in meanwhile.

  4. Settle in

    We help staff connect their devices and keep an eye on delivery during the first days.

Data & backups

Where your mail is kept, and how it is protected

You choose the region where your mail data is hosted, and we tell you exactly where that is. Mail data is backed up so that a deleted message or a damaged mailbox can be recovered.

  • Hosting region chosen by you and stated in the proposal
  • Regular backups of mailboxes, with the schedule and retention agreed in writing
  • Restores of individual messages or whole mailboxes on request
  • Your data stays yours: if you leave, we help you export it

Support

A local team to call

Email problems are rarely convenient. When something is wrong, you talk to the people who set up your service and know how it is configured, by email, on a call, or through a ticket in the client portal.

  • Support by email at support@onesign.sg and through the client portal
  • Changes such as new staff, new aliases or a new domain handled for you
  • Advice when you add other systems that need to send mail

Your brand

Custom mail services

Beyond hosted mailboxes, we can run a dedicated mail server for your company, on your own server or on ours, and provide mail apps for Android, iOS, Windows and macOS published under your company name, logo and colours. Staff install their company’s own mail app, already connected to your mail server, instead of a generic one.

  • Dedicated mail serverOn your infrastructure or ours
  • Your name, logo and coloursIn the apps and on webmail
  • Mail, calendar and contactsIn one app, synchronised with your mail server
  • Push notificationsFor new mail
  • Ready for your domainConfigured out of the box
  • Published and maintainedIn the app stores under your account or ours, as agreed; updates by us
AndroidiOSWindowsmacOS

Fit

Who this suits

Companies that want their email on their own domain with a provider they can speak to directly; businesses that need to know which region their mail is hosted in; and teams that would rather not run a mail server themselves but want more control than a mass-market account gives them.

If you are unsure whether moving makes sense for you, write to us with your current setup and the number of mailboxes, and we will tell you plainly.

Questions

Frequently asked

Can you move our existing mailboxes to One Sign?

Yes. We migrate mail mailbox by mailbox from your current provider, including existing messages, and switch the DNS records when the copy is complete, so staff keep their history and their addresses.

Do we keep our own domain name?

Yes. Mailboxes are on your own domain. We set up the MX records and the SPF, DKIM and DMARC records that let other mail servers trust your mail.

Is spam and malware filtering included?

Yes. Incoming mail is filtered for spam, phishing and malware before it reaches the inbox, with allow and block lists you control.

Where is our email stored?

In a hosting region agreed with you in the proposal, with backups on an agreed schedule.

Can the mail app carry our own company brand?

Yes. We provide mail, calendar and contacts apps for Android, iOS, Windows and macOS under your company name, logo and colours, connected to your own mail server, with push notifications for new mail.

Talk to us about moving your email

Send us your domain, the number of mailboxes and your current provider. We reply with questions or a written proposal.