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Migrate Outlook accounts to new email server

Outlook setup

  • If you don't know how to change, please download Rustdesk or Anydesk, I can remotely help you.

* IMPORTANT!!! *
In Outlook, If existing account is IMAP type. DO NOT simply change the server name and password, you will lost all existing emails.
You must export existing emails to a PST backup. Add the new IMAP account, and then import the backup files again.

  • If existing account is POP3 type, you just need to change the server name, password and connection method. All your existing emails will remains there.

h12 email server connection methods

  • H12 is our main mail server, this server support the following connection method.

WebMail

Incoming Mail Server

POP

  • server name: h12.hksx.com
  • port: 995 SSL/TLS « Try this first
  • port: 110 No-SSL

IMAP

  • server name: h12.hksx.com
  • port: 993 SSL/TLS
  • port: 143 No-SSL

Outgoing mail server

SMTP

  • server name: h12.hksx.com
  • port 465 SSL/TLS « Try this first
  • port 587 STARTLS or No-SSL « second choice
  • port 25 STARTTLS or No-SSL
  • port 2525 STARTTLS or No-SSL

Common Problems

  • Before setup, please try to login WebMail once, to make sure your email address and password are correct!
  • If connection failed, but it ask for password, it means your password is wrong.
  • If connection failed, but it does not ask for password, it means it is a connection problem, please try other connection methods (SSL/STARTTLS/No-SSL, etc)

Why are there so many connection methods? Which one should I use?

  • Most people should try the SSL/TLS connection first. This method should work for 99% of modern devices.
  • Some country/state/company firewall blocked one or the other ports. Some software/device/versions has bug in one or the other connection methods. That's why people invented different workaround methods. Please try other methods if SSL does not work for you.
2025/05/07 08:07 · derek