Connect to Exchange 2013 using IMAP/SMTP from the Internet

Question

Hello,
I would like to enable connectivity to my exchange server using imap and smtp. my exchange server is using the default configuration for imap and smtp which are port 143 and 25 respectively. I have two exchange servers both with CAS and MB roles
installed. I also have an edge server on my DMZ. I have also published my OWA using IIS ARR module. I wonder where I should direct my traffic from my firewall to enable IMAP connectivity taking into considerations my two servers with CAS and MB roles are inside
my network. I also wonder how I can enable redundancy for IMAP connections. Thanks a lot.
Regards,
Pooriya
Pooriya Aghaalitari

Answer 1

Hi Pooriya,
When you install Microsoft Exchange Server 2013, IMAP4 client connectivity isn't enabled. We can do the following steps to configure it:
1. Start two IMAP services: the Microsoft Exchange IMAP4 service and the Microsoft Exchange IMAP4 Backend service.
Set-service msExchangeIMAP4 -startuptype automatic
Start-service msExchangeIMAP4
Set-service msExchangeIMAP4BE -startuptype automatic
Start-service msExchangeIMAP4BE
2. Make sure there is an valid certificate which is assigned with IMAP service. Also confirm the Published Exchange server name (For example: mail.domain.com) has been included in this certificate:
Get-ExchangeCertificate | FL
3. Configure the external IMAP connection settings:
Set-ImapSettings -ExternalConnectionSetting {mail.domain.com:993:SSL}
4. Configure SMTP settings:
Get-ReceiveConnector "*\client Frontend*" | Set-ReceiveConnector -AdvertiseClientSettings $true -Fqdn mail.domain.com
5. You must restart IIS service (running IISReset /noforce from the Command Prompt window) after applying all settings.
For more information about IMAP in Exchange 2013, please refer to:
http://technet.microsoft.com/en-us/library/jj657728(v=exchg.150).aspx
Regards,
Winnie Liang
TechNet Community Support