Most modern mail clients set up an epost.plus account automatically via Autodiscover — just enter your email and password. When manual setup is needed, this tutorial gives you the exact server settings for IMAP, SMTP, CalDAV and CardDAV, along with step-by-step instructions for the common clients UK users choose: eM Client, Thunderbird, Apple Mail, iOS Mail and Outlook.
| Service | Host | Port | Security | Auth |
|---|---|---|---|---|
| IMAP (inbound) | imap.epost.plus | 993 | SSL/TLS | Your full email and password |
| SMTP (outbound, SSL) | smtp.epost.plus | 465 | SSL/TLS | Your full email and password |
| SMTP (outbound, STARTTLS) | smtp.epost.plus | 587 | STARTTLS | Your full email and password |
| POP3 (optional) | pop3.epost.plus | 995 | SSL/TLS | Your full email and password |
| CalDAV (Premium/VIP) | mail.epost.plus | 443 | HTTPS | Your full email and password |
| CardDAV (Premium/VIP) | mail.epost.plus | 443 | HTTPS | Your full email and password |
Username is always your full email address (e.g. [email protected]), never just the local-part.
See the detailed eM Client configuration tutorial.
For CalDAV/CardDAV, install the Cardbook and Lightning-equivalent built-in calendar and add the CalDAV URL from the reference table.
For Contacts and Calendar, use Add Account › Other › Add CalDAV or CardDAV Account separately, with the same server and credentials.
For calendar in Outlook, you may need a third-party add-in to speak CalDAV (Outlook's native calendar support is Exchange-oriented). Alternatively, use webmail for calendar while keeping Outlook for mail.
Modern recommendation: IMAP for almost everyone. POP3 has niche uses but is rarely the right default.
"Authentication failed." Typo in password. Test credentials on webmail first to isolate the issue. If webmail works, the client is misconfigured.
"Cannot connect to server." Port blocked on your network. Corporate firewalls sometimes block 465/587/993. Try from a different network or contact your network admin.
Client keeps asking for password. Outdated password stored. Delete the saved password and re-enter.
Mail syncs but send fails. SMTP authentication disabled in client settings. Ensure "My outgoing server requires authentication" is ticked and uses the same credentials as IMAP.
Certificate warning. Unusual — epost.plus has valid certs. If you see a warning, verify you are using the exact hostname from the reference table. Do not accept unknown certificates without investigating.
MFA prompt but client does not show it. Some clients do not support interactive MFA. Generate an application password in webmail › Settings › Security and use that instead.
Q: Can I use multiple clients at the same time?
A: Yes. IMAP is designed for it. eM Client on laptop + iOS Mail on phone + webmail on browser — all show consistent state.
Q: Does my mailbox quota include all devices?
A: Yes, mailbox quota is server-side. Device-local caches do not count.
Q: Should I pick SSL or STARTTLS for SMTP?
A: Either works. SSL/TLS on port 465 is slightly simpler to configure. STARTTLS on port 587 is the "modern standard" but functionally equivalent.
Q: Can I use a legacy client that only supports unencrypted IMAP?
A: No. epost.plus requires TLS. Upgrade your client or use the webmail.
Q: How do I sync calendar with Apple Calendar on macOS?
A: System Settings › Internet Accounts › Add Account › Other › CalDAV. Enter username, password and server (mail.epost.plus).