Exchange Server 2019 : Enable POP/IMAP Services2023/02/08

	POP/IMAP services are disabled by default becuase users can use Email services on the web based Outlook application. However, it's possible to use POP/IMAP services to enable them if you need.
[1]	Run PowerShell with Admin Privilege and enable services.

Windows PowerShell
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PS C:\Windows\system32> Get-Service | Out-String -Stream | Select-String -Pattern "POP","IMAP" 

Stopped  MSExchangeImap4    Microsoft Exchange IMAP4
Stopped  MSExchangeIMAP4BE  Microsoft Exchange IMAP4 Backend
Stopped  MSExchangePop3     Microsoft Exchange POP3
Stopped  MSExchangePOP3BE   Microsoft Exchange POP3 Backend

# for example, start IMAP4 related services
PS C:\Windows\system32> Start-Service MSExchangeImap4 
PS C:\Windows\system32> Start-Service MSExchangeIMAP4BE 

# to enable Auto-start, set like follows
PS C:\Windows\system32> Set-Service MSExchangeImap4 -StartupType Automatic 
PS C:\Windows\system32> Set-Service MSExchangeIMAP4BE -StartupType Automatic 

# after staring IMAP4 services, it listens on 143/tcp, 993/tcp
# * if POP3, it listens on  110/tcp, 995/tcp
PS C:\Windows\system32> netstat -a | Select-String -Pattern ":143",":993" 

  TCP    0.0.0.0:143            rx-7:0                 LISTENING
  TCP    0.0.0.0:993            rx-7:0                 LISTENING
  TCP    [::]:143               rx-7:0                 LISTENING
  TCP    [::]:993               rx-7:0                 LISTENING

# firewall rules has been already configured
PS C:\Windows\system32> Get-NetFirewallRule | Where-Object DisplayName -Like 'MSExchangeIMAP4 (TCP-In)' | Get-NetFirewallPortFilter 

Protocol      : TCP
LocalPort     : {143, 993}
RemotePort    : Any
IcmpType      : Any
DynamicTarget : Any

Exchange Server 2019 : Enable POP/IMAP Services (GUI)

[2]	On GUI configuration, open [Services] and start target services.

Exchange Server 2019 : Settings on Client Computer

	It's possible to use Email services on a Client Computer. The example below is for Thunderbird on Windows 11.
[3]	Run Thunderbird and Click [Set up an account] - [Email].

[4]	Input any name which is displayed as email-Sender and also input email address and password, and then Click the [Configure manually] link.

[5]	Input required information and then that's OK if [Configuration found by ***] like follows.

[6]	Try to send message between accounts to verify settings.

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