OquMail vs Posteo: Business Email on Your Domain vs Private Mail

Posteo is one of the most respected privacy email providers in Europe, and it is often suggested to small businesses that ask for something ethical and cheap. The catch is that Posteo does not support custom domains, which is the one thing a business needs. OquMail gives you that for free. This comparison explains where each fits.

Quick summary

• Mailboxes: Posteo one personal account per subscription; OquMail up to 15 mailboxes free
• Free plan: Posteo none, but very cheap; OquMail free with 3 domains and 5 GB per mailbox
• API: Posteo none; OquMail transactional send API with Bearer keys
• DNS guidance: Posteo not applicable, no domains; OquMail guides MX, SPF, DKIM and DMARC with live checks
• IMAP/SMTP: both support standard clients

Who each is for

Posteo is for an individual who wants private, ad-free email, pays anonymously and is happy with an @posteo address. It is a personal product on purpose, and its refusal to add custom domains is part of keeping the service simple and hard to abuse. OquMail is for a business that needs name@yourcompany.com for its staff, guided DNS so mail lands in the inbox, and a send API for its website or app, without paying per user. The two are not really rivals; they answer different questions.

Feature comparison

• Mailboxes: Posteo one personal account per subscription; OquMail up to 15 mailboxes free
• Free plan: Posteo none, but very cheap; OquMail free with 3 domains and 5 GB per mailbox
• API: Posteo none; OquMail transactional send API with Bearer keys
• DNS guidance: Posteo not applicable, no domains; OquMail guides MX, SPF, DKIM and DMARC with live checks
• IMAP/SMTP: both support standard clients
• Storage: Posteo a base quota with paid upgrades; OquMail 5 GB per mailbox

Where Posteo wins

• Anonymous registration and payment with no personal data held
• Green energy, strong transparency reports and a clear ethical stance
• Very low flat price for an individual
• Optional encrypted storage of the mailbox at rest

Where OquMail wins

• Your own domain, which Posteo does not offer at all
• Up to 15 team mailboxes and 3 domains at no cost
• DNS setup that verifies each record and explains errors
• Send API and per-message delivery logs for business mail

Total cost at 5 and 15 users

Posteo is not built for teams: 5 or 15 users would mean 5 or 15 separate personal subscriptions and none of them on your domain. OquMail is free at both sizes. For a business the comparison is therefore less about money and more about whether a personal @posteo address is acceptable on your invoices and website. Usually it is not.

The free third option: OquMail

OquMail gives a small business what Posteo deliberately leaves out: addresses on the company domain, several role mailboxes such as info@ and billing@, and a way for the website to send confirmations. Transport is encrypted with TLS on IMAP 993 and SMTP 587.

• Free plan: up to 15 mailboxes, 3 domains, 5 GB per mailbox, no credit card
• Webmail included; IMAP/SMTP for Outlook, Apple Mail, Thunderbird and phones
• IMAP mail.oqumail.com port 993 (SSL/TLS); SMTP mail.oqumail.com port 587 (STARTTLS)
• Guided SPF, DKIM and DMARC with live DNS verification; MX is mail.oqumail.com priority 10
• Transactional send API at https://api.oqumail.com/api/v1/emails with Bearer API keys (from, to, subject, html)
• Per-message delivery logs so you can see the exact response a receiving server gave

Verdict by scenario

• Private individual who values anonymity: Posteo
• Sole trader who needs a domain address for credibility: OquMail
• Small team of up to 15 with a website that sends receipts: OquMail
• Activist or journalist wanting a personal account with minimal data: Posteo

Common questions

Can I forward my domain to Posteo instead?

You can forward into a Posteo account, but replies still come from @posteo.de and you get no domain-level SPF or DKIM alignment. A real mailbox on your domain is the cleaner answer.

Is OquMail as private as Posteo?

OquMail is a business email service, not an anonymous one. It encrypts transport with TLS and does not sell advertising, but it is not designed for anonymous sign-up the way Posteo is.

Can I use both?

Yes. Many people keep a personal Posteo account and put their business on a domain with OquMail. Both work in the same mail app via IMAP.

What does a business lose by using a Posteo address?

Credibility and control. Customers see a third-party address on invoices, you cannot create role mailboxes such as billing@ or support@ on your brand, and SPF and DKIM align to posteo.de rather than to you. If a staff member leaves, the address leaves with them. A domain mailbox on OquMail fixes all four at no cost.