250 2.0.0 OK · SG-HOSTED · ENGINEER-STAFFED · SINCE 2012
Every message your company sends gets a reply you never see. 250 OK means it landed. Anything else means your quote, your invoice or your tender reply is sitting in a junk folder while you wait for an answer that is not coming.
Rezolva has run Singapore infrastructure since 2012. The email hosting Singapore companies get from us is built around that one reply: mailboxes on your own domain, on Microsoft 365, Google Workspace or a cPanel server, with SPF, DKIM and DMARC set before the first message leaves, and a Singapore engineer on the line when one does not arrive.
Illustration of how receiving servers read the three records. Turn one off and send again — it is the same test we run on your domain before we quote.
One message leaving your domainThe conversation your mail server has with the customer’s, every single time — example transcript.
THE RECEIPT
Every provider on this search result sells mailboxes. Very few of them will tell you why the first invoice a new domain sends so often lands in junk. The reason is three DNS records, and the lab above is literally what a receiving server does with them. This is the part of email hosting Singapore companies pay for without knowing it, and the part we set up before a single mailbox is created.
01 · SPF
A one-line record on your domain that lists the servers permitted to send mail with your name on it. Without it, anybody can. With a sloppy one — the ten-lookup limit is real — your own newsletter tool fails the check and your genuine mail is the one that gets refused.
02 · DKIM
Each outgoing message is signed with a private key held by your mail platform; the public half sits in DNS. Gmail and Outlook check the signature on arrival. It is the difference between a letter with a seal and a letter with a name typed at the bottom.
03 · DMARC
The policy record: quarantine or reject anything that fails the first two, and send us the report. Since February 2024 Google and Yahoo require it from anyone sending 5,000 messages a day; in practice a missing policy already costs you inbox placement at far lower volumes.
All three are published on the zone before go-live, tested from an outside mailbox, and re-checked every time a new sending tool — a CRM, an accounting system, a booking platform — is added to the domain. That last part is where most self-managed setups quietly break.
IN THE BOX
Value first, then platform, then price. Whatever platform the mailboxes sit on, the business email hosting Singapore firms get from Rezolva carries the same baseline. It is the list we hand a new client on day one, so there is nothing to discover in month three.
Rezolva · MAILBOX
name@yourcompany.com.sg on every device, with shared calendars and contacts where the platform supports them. Aliases, groups and a catch-all for the addresses printed on ten-year-old name cards.
Rezolva · DNS
MX, SPF, DKIM, DMARC and autodiscover records written into your DNS by us, with a copy in your file. When you change web host, the mail keeps flowing because the records are yours and known.
Rezolva · DEVICES
Outlook, Apple Mail, Android and webmail configured against the same IMAP or native account, so a message read on the train is read on the desk. Old devices wiped from the account when someone leaves.
Rezolva · HOTLINE
One hotline, staffed. A bounced tender reply at 4pm is handled that afternoon, not logged into a ticket queue in another time zone. Since 2012, the same number.
| Baseline item | What it means for you | Checked |
|---|---|---|
| Spam and malware filtering | Platform-native filtering tuned on your domain, with a quarantine you can see, not a black hole | Weekly |
| Encryption in transit | TLS enforced between your devices, our relay and the receiving server; STARTTLS on port 587, IMAPS on 993 | At setup, then monthly |
| Migration | Existing mail, folders, contacts and calendars copied across while the old mailbox keeps working | Once, verified item-count |
| Mailbox size | 50 GB on Microsoft 365 Business, 30 GB to 5 TB pooled on Google Workspace, sized per mailbox on cPanel | Quarterly usage report |
| Retention and backup | Deleted-item recovery on the platform, plus a separate backup where the mail is business-critical | Restore test each quarter |
| Leaver process | Mailbox converted, forwarded or archived within the day; devices signed out; licence reclaimed | Same day |
THE DECISION
This is the one decision that matters more than the price, and it is the one most providers avoid because they only sell one of the three. Rezolva runs all of them, so the Singapore email hosting we recommend is the one your team will still be using in five years, not the one with the best margin this quarter. Answer three questions; the panel tallies them.
Q1 · Where does the team already live?
Q2 · What runs alongside the mail?
Q3 · How many mailboxes, honestly?
How the panel reads it
Recommended platform
Desktop Office, Exchange mailboxes of 50 GB and Teams in one licence. The default for a Singapore company with departments, a finance team and a lot of Excel.
| Platform | Built for | Mailbox | Comes with | Watch for | Page |
|---|---|---|---|---|---|
| Microsoft 365 Business | Companies that run on Outlook, Excel and Teams; up to 300 users per tenant | 50 GB Exchange, 1 TB OneDrive per user | Desktop Office on Standard and above, Defender and Intune on Premium | Licences outlive leavers unless somebody reclaims them | Microsoft 365 Singapore |
| Google Workspace | Teams that live in Gmail, Docs and Meet; remote and mobile-first firms | 30 GB, 2 TB or 5 TB pooled per user by edition | Drive, Meet, Chat, Gemini on Business editions | Storage is pooled, so one archive-hoarder empties the pool for everyone | Google Workspace Singapore |
| cPanel email | Small firms and second brands that need mailboxes on the domain and nothing else | Sized per mailbox on the server | Webmail, forwarders, autoresponders, the same panel as your website | No Teams, no Drive; spam filtering needs tuning by a person | cPanel email hosting Singapore |
Two of the three are subscriptions billed per user per month; cPanel is billed per server or per mailbox. The honest rule: if the answer to Q1 is Outlook, the platform is decided and the rest is sizing. If the answer is “just email”, do not pay for a suite you will not open.
FRIDAY 18:00 → MONDAY 08:30
Most companies come to us from a provider, not from nothing: a reseller that stopped answering, a web host whose mail server landed on a blocklist, a suite bought for the wrong reasons. Moving email hosting in Singapore is a sequence, and the sequence is why nobody notices.
Day 1 · SurveyFrom: RezolvaMailboxes, aliases, groups, the forwarder to the boss’s phone, the printer that scans-to-email. The list is what the cutover is checked against.
Day 2 · StageFrom: RezolvaNew platform provisioned, SPF, DKIM and DMARC published, TTL on the MX record lowered to five minutes so the change propagates in one coffee break, not a day.
Fri 18:00 · CopyFrom: RezolvaYears of mail, folders, contacts and calendars copied by IMAP or native migration while the old mailboxes keep receiving. Item counts compared per mailbox, not eyeballed.
Sat 10:00 · SwitchFrom: RezolvaMail starts arriving on the new platform. The old mailboxes are kept alive for 72 hours and a final delta copy catches anything delivered in the overlap.
Mon 08:30 · OpenTo: whole companyPhones and laptops reconfigured Friday, tested Monday. An engineer is on site or on the line for the first morning, because the first morning is when the odd address turns up.
THE NUMBER, LATE
Three platforms, three ways of counting. Two are per user per month at the vendor’s published rate plus our managed layer; one is a fixed server. The email hosting services Singapore quote you get back is one number per mailbox against a named platform, and it includes the baseline table above — the stamps, the devices, the hotline. Nothing on the invoice you did not read here.
PLATFORM 01
Per user · per month · vendor list + managed layer
Licence fromS$9.67/user/mo
Business Basic at Microsoft’s published Singapore rate with 9% GST (Microsoft lists US$7.00 ex GST; S$1.2674 to the dollar); Standard and Premium priced per plan. Our managed layer per user is quoted on the plan you pick.
PLATFORM 02
Per user · per month · vendor list + managed layer
Licence fromS$10.25/user/mo
Business Starter at Google’s published Singapore rate with 9% GST (Google lists S$9.40 ex tax) on an annual commitment; Standard and Plus priced per edition. Managed layer per user quoted with it.
PLATFORM 03
Per mailbox · per month · Singapore server
FromS$8.34/mailbox/mo
Mailboxes on a managed cPanel server in Singapore, sized per address, incl. 9% GST — the rate falls to about S$5 a mailbox on a fifty-mailbox account. The right answer for a firm that needs eight addresses and no suite.
Indicative pricing — vendor licence rates are Microsoft’s and Google’s published Singapore figures on 7 September 2026, shown with 9% GST (Microsoft’s US-dollar list converted at S$1.2674, both vendors publish excluding tax) and move with them; the cPanel figure and the managed layer are quoted per company once mailboxes are counted.
THE PART NOBODY SELLS
Email is the front door of every Singapore breach we have been called to clean up: a supplier’s invoice with a changed bank account, a director’s mailbox forwarding silently to an outside address, a password reused from a leaked site. The Singapore email hosting services worth paying for treat these as part of hosting, not an upsell.
WHO THIS IS FOR
The buyer is rarely the person who will use the mailboxes. It is the director, the office manager or the one technical partner who gets the call when mail stops. Email hosting for small business Singapore firms is usually the first thing Rezolva runs for a client, and the reason the rest of the stack follows.
Purchase orders, delivery orders and bank details move by email all day. SPF, DKIM and DMARC are what stop a forged PO with a changed account number reaching your customer with your name on it.
Tender replies and signed proposals cannot bounce. Mailboxes with a full history, migrated intact, and a retention setting that keeps five years of client correspondence findable.
Confidentiality and evidence. Encryption in transit, MFA on every account, and a separate backup so a deleted thread is a five-minute restore, not a lost matter.
A new Pte Ltd, a franchise, a brand launched last month: three to eight mailboxes on a fresh domain, on cPanel or Workspace, live in a day and moved to a suite later without another migration.
THE REST OF THE STACK
Email is one of eight things Rezolva runs, and the one most clients start with. The three platform pages below go deeper than this hub; the two beside them are where the mailboxes meet the website and the backup.
One domain, one teamMail, website, backup and the devices they run on, looked after by the same Singapore engineers since 2012.
Mailboxes on your own domain that work on every device, the DNS records that make them deliverable (MX, SPF, DKIM, DMARC), spam and malware filtering, encryption in transit, migration of your existing mail, and a person to call when a message does not arrive. On this page that baseline is the same whether the mailboxes sit on Microsoft 365, Google Workspace or a cPanel server; what changes is what comes with the mailbox — Office and Teams, or Drive and Meet, or nothing but mail.
The one your team will actually use. If they live in Outlook and Excel, Microsoft 365 Business Basic or Standard; if they live in Gmail and Docs, Google Workspace Business Starter or Standard; if they need mailboxes and nothing else, a cPanel server costs less and does the job. Any best email hosting in Singapore ranking that names one platform for everybody is selling that platform. The three-question panel above is our own selection rule, and we run all three, so it has no reason to lie.
Suites are priced per user per month at the vendor’s published Singapore rate — Microsoft 365 Business Basic is about S$9.67 and Google Workspace Business Starter S$10.25 per user per month including 9% GST on an annual commitment as of September 2026 (Microsoft lists US$7.00 and Google S$9.40, both excluding tax) — plus a managed layer we quote per user. cPanel email is billed per mailbox on a Singapore server. Send the number of mailboxes and the reply is a single per-mailbox figure against a named platform.
Almost always one of the three records. SPF missing or over the ten-lookup limit, DKIM never enabled on the platform, or no DMARC policy, which since 2024 Gmail and Yahoo penalise outright. The second cause is a sending tool — a CRM, an invoicing system — added to the domain without being added to SPF. The lab at the top of this page is the check; we run it on your live domain before we quote and it usually explains the last six months.
Yes. The new platform is built alongside the old one, history is copied while the old mailboxes keep receiving, and the MX record moves on a Saturday morning with the old mailboxes held for 72 hours to catch stragglers. Item counts are compared per mailbox before we call it done. Most firms notice on Monday that Outlook asked for a password once.
Both, and we say which on the quote. Microsoft 365 and Google Workspace mailboxes live in Microsoft’s and Google’s data centres, with Rezolva as the tenant administrator; cPanel mailboxes sit on a managed server in Singapore. What is ours in every case is the DNS, the configuration, the migration, the security baseline and the hotline — the parts that decide whether the mail arrives.
Most email hosting providers Singapore comparisons rank mailbox price per month and mailbox size. Both matter less than deliverability and what happens when someone leaves. Ask any provider on the list two questions: is DMARC published with a reject policy on your own domain, and who reclaims a licence when a staff member resigns. The answers sort the list faster than the price column.
The nearest thing to an honest email hosting Singapore review is the delivery log of your own domain, which is why we start with it rather than a testimonial. Rezolva has run infrastructure for Singapore organisations since 2012 with 99% client retention, and the email line is where most of those relationships began. We are happy to put you in touch with a client on the same platform you are considering.
Same day: password reset, sessions and devices signed out, forwarding rules checked, mail forwarded or converted to a shared mailbox for the manager, and the licence reclaimed so you stop paying for it. After the retention period you set, the mailbox is archived or deleted with a record of when. It is the most common source of both wasted licences and quiet data leaks, so it is a written process, not a favour.
Send your domain name and how many mailboxes you run. You get back a written read of your SPF, DKIM and DMARC as the world sees them, the platform we would put you on and why, and a per-mailbox figure. Your current mail keeps working while we talk.
