CONNECT AI
한국어

CONNECT AI email connection guide

Connect MailPlug mail

How to connect the company mail you use on MailPlug to CONNECT AI. You keep your existing address. There is no need to set up Google Workspace or change your domain settings.

If your MailPlug screens are in Korean, menu names are written as they appear there, with the English meaning in brackets.

Time needed
About 10 minutes
You need
The MailPlug email address to connect and its sign-in password
Where
Easiest on a computer
Start with step 1Download PDF

The same guide our support team sends.

At a glance

First prepare in your mail service, then connect in CONNECT AI. Follow the steps in order.

  1. In MailPlugStep 1: Allow other programs to fetch your mail
  2. In MailPlugStep 2: Create an app password
  3. In CONNECT AIStep 3: Open the connection screen
  4. In CONNECT AIStep 4: Fill in the fields
  5. In CONNECT AIStep 5: Test the connection and save
In MailPlug

Step 1: Allow other programs to fetch your mail

MailPlug keeps outside programs away from a new account until you allow them. This step opens that door.

  1. Sign in to MailPlug with the mail account you want to connect.

  2. In Mail, click 환경설정 (Preferences) (the gear icon) and open 메일 설정 (Mail settings).

  3. On the POP3/IMAP 설정 (POP3/IMAP settings) tab at the top, set POP3 사용 설정 (Use POP3) to 사용 (On) and save.

MailPlug mail › 환경설정 (Preferences) › 메일 설정 (Mail settings) › POP3/IMAP 설정 (POP3/IMAP settings)
POP3 사용 설정 (Use POP3)사용 안 함 (Off)사용 (On) (choose this)
Example drawing · the real screen may look slightly different

Good to know

  • On some screens it appears as the gear icon at the bottom left of Mail, then 사용자 설정 (User settings), then POP3/SMTP 사용 설정 (Use POP3/SMTP).
  • If POP3 is not used for 30 days, this setting switches back to Off by itself. If you come back after a long break, check this first.
Next step · Create an app password
In MailPlug

Step 2: Create an app password

MailPlug does not let other programs sign in with your account password. Create a separate app password and enter it in CONNECT AI.

  1. At the top right, click 프로필 (Profile) and open 설정 (Settings) (the gear icon).

  2. Under 로그인 보안 설정 (Sign-in security), click 앱 비밀번호 (App passwords) and then 생성하기 (Create).

  3. Copy the password on the screen right away and keep it somewhere safe. It is shown only once.

Top right of the MailPlug screen
  1. 프로필 (Profile)
  2. 설정 (Settings)
  3. 로그인 보안 설정 (Sign-in security)
  4. 앱 비밀번호 (App passwords)
  5. 생성하기 (Create)
Example drawing · the real screen may look slightly different

Good to know

  • If an app password is not used to sign in for two weeks, MailPlug deletes it. If you paused the connection for a while, create a new one and update the password in CONNECT AI as well.
Next step · Open the connection screen
In CONNECT AI

Step 3: Open the connection screen

  1. Sign in at connectai.kr on a computer.

  2. In Settings, go to Email accounts and click Add email account. You can also type connectai.kr/connect-email in the address bar to open the same screen.

connectai.kr · Connect your email account
Gmail (Google)Connect Gmail via your Google account (OAuth 2.0)
Outlook (Microsoft)Microsoft 365 / Outlook.com
Other email (SMTP) (choose this)Naver, Daum, corporate mail servers, and more
Continue
Example drawing · the real screen may look slightly different

  1. On the Connect your email account screen, choose Other email (SMTP) and click Continue.

  2. When the POP3/IMAP setup screen opens, go on to the next step.

Good to know

  • MailPlug mail does not connect through the Gmail (Google) button. Be sure to choose Other email (SMTP).
Next step · Fill in the fields
In CONNECT AI

Step 4: Fill in the fields

If the screen has a Mail service field at the top, choose MailPlug. The server address, port and security fill in by themselves. If there is no such field, enter the values below one by one. Either way, check at the end that the fields match the values below.

connectai.kr · POP3/IMAP setup

Mail service (only if shown)

Choose from the list
MailPlug

If this field is there, choose MailPlug. The server fields below fill in.

Account

Email address
Your full MailPlug email address

e.g. sales@mycompany.co.kr

Password
app password

MailPlug does not accept your account password in other programs.

Confirm password
The same password again

Incoming mail server

Protocol
POP3

Be sure to choose POP3. Companies that signed up for MailPlug in or after April 2025 cannot use IMAP, so this guide uses POP3 for everyone.

Server address
pop3.mailplug.co.kr
Incoming login ID (optional)
Leave blank
Port
995
Security
SSL/TLS

Choosing STARTTLS will not connect.

Outgoing mail server (SMTP)

SMTP server
smtp.mailplug.co.kr
Outgoing login ID (optional)
Leave blank
Port
465

If you type it yourself, replace the default 587 with 465.

Security
SSL

If you type it yourself, change the default TLS/STARTTLS to SSL.

Example drawing · the real screen may look slightly different
Next step · Test the connection and save
In CONNECT AI

Step 5: Test the connection and save

  1. Click Test connection at the bottom of the screen.

  2. Check that both of the results below appear.

connectai.kr · POP3/IMAP setup
Incoming serverIncoming connection succeeded
Outgoing serverOutgoing connection succeeded
Test connectionSave and finish
Example drawing · the real screen may look slightly different

  1. If both succeed, click Save and finish. If either one fails, this button stays disabled — see “If it won’t connect” below.

  2. You’re done when Email accounts in Settings shows Connection normal.

That’s it — you’re connected

After connecting

  • Email you send from CONNECT AI goes out from this MailPlug address.
  • Buyer replies are fetched every 15 minutes. If a reply doesn’t show up right away, give it a little time.
  • Your mail stays in your MailPlug mailbox. CONNECT AI never edits or deletes it.
  • Changing any field clears the test results. After a change, click Test connection again.

If it won’t connect

When a test fails, the screen tells you why. Find the message below.

If you see this

Authentication failed

What to do
  1. Check that you entered the app password. Your account password will not work.
  2. Check that Use POP3 from step 1 is On. It switches off by itself after 30 days without use.
  3. If you created the app password a while ago, it may have been deleted after two weeks without use. Create a new one and enter it.
  4. If it still fails, your company admin may have turned POP3 off or restricted where connections come from. See “Still failing with the right password?” below.
If you see this

Connection test failed for an unknown reason

What to do
  1. Check that you entered the app password.
  2. Check that you finished the steps in MailPlug (from step 1).
  3. If both are right, your company may block other programs from connecting. See “Still failing with the right password?” below.
  4. If it still fails, take a screenshot and send it to our support team below.
If you see this

The server didn't respond Couldn't reach the server

What to do
  1. Check the server address and port again. The ports are 995 for incoming and 465 for outgoing.
  2. Make sure there are no extra spaces or missing letters in the addresses.
If you see this

TLS negotiation failed

What to do

Check the security setting again: SSL/TLS for the incoming server and SSL for the outgoing server.

If you see this

Your mail service is blocking connections from the CONNECT AI server's IP address

What to do

Your mail service is blocking the CONNECT AI server. See “Still failing with the right password?” below.

If you see this

Form values changed during the test

What to do

You changed a field while the test was running. Click Test connection again.

If you see this

The Test connection button is disabled

What to do

Fill in every field: the full email address (including everything after @), the password and its confirmation, the incoming and outgoing server addresses, and the ports (numbers only). Also check that both password fields match.

If you see this

The Save and finish button is disabled

What to do

Both the incoming and the outgoing test must succeed. Find the message from the side that failed in this list.

Still failing with the right password?

MailPlug lets your company admin block other programs from reaching mail. When that happens, the screen may say “Authentication failed” even though the password is right.

  • In the admin settings under POP3/IMAP, POP3 must be on. If the admin turns it off, it applies to every account.
  • If the admin uses country or IP restrictions under 보안 관리 (Security management), 접근 허용 (Access control), the CONNECT AI server must be allowed in. Ask our support team for the server IP.

Leave your domain settings alone

Google Workspace and MX records

  • You do not need to change your domain settings to connect mail. You do not need Google Workspace either.
  • If you change your domain’s MX records or add another provider’s (such as Google’s), mail to your company goes there first. Mail for staff who have no account there can bounce.
  • If you have already changed them, remove only the line you added and keep your original mail service’s lines.

Need help?

Send us a screenshot of where you got stuck and we will look at it with you. You do not need to send your password.

CONNECT AI supportsupport@connectai.krWeekdays 10:00–18:00 (KST)