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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!!! *
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, change the IMAP account, and then import the emails 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