Written By Chirag Arora  
Anuraag Singh
Approved By Anuraag Singh 
Published On November 14th, 2023
Reading Time 5 Minutes Reading

Is your IMAP email server not responding? Worry not! We had several users come up to us with the same query. Therefore, we have drafted this technical write-up to help to resolve the issue. So, without further ado, let’s get started with the article.

If you are working with any of the following applications you must have an idea about IMAP Server

  • Outlook
  • Thunderbird
  • Outlook Express
  • Window Live Mail
  • Opera Mail etc.

You would have seen that IMAP Email Server is not responding while sharing and receiving emails in IMAP Server based application.

Before understanding the reasons that why the IMAP Email Server is Not Responding lets get acquainted with the IMAP server and why it is important for the functioning of modern email communication.

Whenever we talk about IMAP, we also discuss POP3. Both go hand in hand. It is the contemporary of IMAP. The main reason that IMAP is advance than POP3 that it allows multiple devices to have access to the mailbox. Unlike POP3 it doesn’t delete email from the server without permission. Here are the major differences between them.

imap vs pop3

Possible Reasons For IMAP Email Server Is Not Responding

  • Internet or Wi-Fi Connection is not established
  • Temporary Server Unavailability
  • SSL setting is not done properly
  • Improper Configuration of Account.

Quick Solution: Users can opt for SysTools Mac IMAP Server Backup Tool to effortlessly backup IMAP mailboxes to PST and other file formats.


  • Fix Internet Connection
  • Temporary Server Unavailability
  • Configuration of SSL Setting
    • Why SSL fails to set up
    • SSL configuration in IMAP
  • Remove And Recreate IMAP Account

So, these are the top solutions to try out when your IMAP email server is not responding. Further in the blog, we are going to discuss and explain eash and every solution. so, let’s continue with the following segments of the article.

1. Fix Internet Connection

The most common issue regarding IMAP Email Server is Not Responding is slow or disconnected internet. You can refer to fix the Internet connection issue.

2. Temporary Server Unavailability

IMAP constantly needs an internet connection and an active Server to keep it functional. Though there is no solution to fix the Email Client-Server, you can keep backup of your emails in tragic conditions like IMAP Email Server is Not Responding and unavailability of the server.

3. Configuration of SSL Setting

Before enacting the SSL configuration, Lets understand about SSL (Secure Socket Layer)

  • Encryption-based internet security protocol.
  • It provides an encrypted secure connection between application like between Web server and Client
  • Developed by Netscape in 1995
  • Uses TCP (Transmission Control Protocol) for an end to end encryption.

Why SSL fails to set up

  • Improper Configuration of SSL certificate during Installation
  • Incorrect details in the SSL certificate. To check the configuration reach to SSL Checker free services of Qualys SSL Labs.
  • The trusted certificate chain is broken due to the expired root CA or it could not verify.
  • Mismatch of domain names while accessing before the issuing of a certificate from CA.

SSL configuration in IMAP

To establish a connection using SSL, please use these ports

  • IMAP Port No – 993
  • Outgoing Server (SMTP) – 465

It will resolve the issue regarding SSL configuration

4. Remove And Recreate IMAP Account

Sometimes the account is not configured properly. So you need to remove and re-add the account. Follow these steps to solve the issue of IMAP Server is Not Responding Outlook.

  • Open Control Panel then select the Mail from the available options. Click on the Email Account tab to open.
  • Select the account and by clicking on Remove you can remove the account from the Account list.
  • Then click on the New option to recreate the profile.
  • In the new Add New Email Account window, you would ask to fill in details of Name, email address, and password in it.
  • You can checkbox Manually configure server settings >> Next. It will open a new window. Select Internet E-mail account then Next
  • Choose either POP3 or IMAP to set up an account. Fill the domain details in the mail server space.
  • Click on More Setting >> Advanced tab and fill the Port for IMAP and SMTP

By default, IMAP protocol carries these ports

  • Incoming Server (IMAP) – 143
  • Outgoing Server (SMTP) – 465

You can keep the same, or if you want to establish an SSL connection then use these port

  • Incoming Server (IMAP) – 993
  • Outgoing Server (SMTP) – 465

Then click on the Outgoing Server tab and checkbox the authentication option and click OK to implement the changes.

After the configuration took place for the setup of IMAP. You would see a message for successful completion.


IMAP is an advanced email server protocol that is widely used by most Email Web clients. But sometimes IMAP Email Server is Not Responding Outlook issue arises because of many technical errors and incorrect configuration. We discussed the fixes that can solve these issues. These situations are inevitable but you can brace yourself for a situation like these if you have a complete download of the mailbox on your computer. It will provide you direct reach to your data at any moment.


By Chirag Arora

Chirag Arora is a seasoned professional who wears multiple hats in the digital realm. As a Digital Marketing Manager, he orchestrates successful online campaigns, optimizing brand visibility and engagement. Additionally, Chirag brings meticulous attention to detail to his role as a Content Proofreader, ensuring that every piece of content shines with accuracy and clarity.