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Guide · A1 email

The official A1 server settings, in English

A1 Email Not Working — The Settings That Are Correct

A1 mailbox refusing to send or receive? Here are the correct A1 server settings and the usual causes — in English, so you can fix it in minutes.

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Mon–Sat 8am–8pm · Free remote diagnosis via RS1

Workshop diagnosis € 29 — waived if you go ahead with the repair. All prices include VAT.

The settings that are actually correct

Setting Value
IMAP server (incoming) securemail.a1.net · port 993 · SSL/TLS
POP3 alternative securemail.a1.net · port 995 · SSL/TLS
SMTP server (outgoing) securemail.a1.net · port 587 · STARTTLS
Outgoing authentication Required — same username/password as incoming

The single most common mistake: SMTP authentication switched off. Receiving works, sending fails — turn authentication on and it sends again.

Other classics

  • Attachment limits: A1 allows about 10 MB outgoing and 20 MB incoming. Bigger files: use a share link.
  • Mailbox full: A1 webmail starts at 40 MB (expandable to 1 GB) — a full mailbox silently rejects mail. Log into A1 webmail and empty large folders.
  • Password unclear? The mailbox password is managed in your A1 account — reset it there, then update it in your mail app on every device.

Still stuck?

Check the webmail first: if mail works at webmail.a1.net but not in your app, the app settings are wrong — exactly what a free remote first look finds in minutes. A1 service line: 0800 664 100.

Frequently asked questions

I can receive but not send.

Almost always missing SMTP authentication: enable authentication for the outgoing server (securemail.a1.net, port 587, STARTTLS) with the same credentials as incoming.

Mail works in webmail but not in Outlook/Apple Mail.

Then the account settings in the app are wrong — compare them against the table above, especially ports and SSL settings.

My A1 mailbox seems full.

Webmail storage starts at 40 MB — old mails with attachments fill it fast. Delete in webmail or expand the storage in your A1 account.

Can you set it up for me remotely?

Yes — mail account fixes are classic RS1 jobs: first look free, then € 1.65/min. Usually done in 15–20 minutes.

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