Troubleshooting POP3 | Zoho CRM - Help

Troubleshooting POP3

1. Emails are not syncing with CRM records.
  1. The storage limit with POP is 5GB, if the mailbox contains more than 5GB of emails then new emails will not be synced unless additional storage is purchased with Zoho Mail or unwanted emails are deleted from the mailbox.
  2. To check the storage, open the Email tab in CRM and go to Settings and then Mail Accounts and look under the name and email address for the size of the mailbox.

  3. If storage is available, then the password by opening the Email tab in CRM and going to Settings and then Mail Accounts. Update the password under Incoming and save it.
  4. If TFA is enabled in webmail, generate an app-specific password from webmail and then use the app-specific password in Mail Accounts.
2. I am getting an "Authentication failure" message when I try to send emails.
  1. Update the password by opening up the Email tab and going to Settings and then Send mail as and clicking on the email address under External from addresses to update the password.
  1. If TFA is enabled in webmail, generate an app-specific password from webmail and then use the app-specific password in Mail accounts.

3. Why is email is being sent from the wrong "From" email address?
Ensure that the correct email address is selected under Send Email as and click Save button at the bottom-right corner.

4. Why am I unable to back up my email data?
As an administrator, ensure that POP is configured in the user's account with the sharing type set to "Public" and that all the emails are showing up in the Email module. Then deactivate the user and go to Setup and select Security Control and then Zoho Mail add-on Users. In the Zoho Mail Add-on Users page, select the checkbox for the deactivated user and select Backup.
Notes: For POP, the accepted port numbers for incoming ports are 995 and 143. For outgoing ports are 465, 587, and 25.

    Zoho CRM Training Programs

    Learn how to use the best tools for sales force automation and better customer engagement from Zoho's implementation specialists.

    Zoho CRM Training
      Redefine the way you work
      with Zoho Workplace

        Zoho DataPrep Personalized Demo

        If you'd like a personalized walk-through of our data preparation tool, please request a demo and we'll be happy to show you how to get the best out of Zoho DataPrep.

        Zoho CRM Training

          Create, share, and deliver

          beautiful slides from anywhere.

          Get Started Now

            Get started with Zoho Sign

            in a few quick steps!

            Download Help Guide

                      Still can't find what you're looking for?

                      Write to us:



                        Zoho Marketing Automation

                          Zoho Sheet Reources


                              Zoho Forms Resources

                                Secure your business
                                communication with Zoho Mail

                                Mail on the move with
                                Zoho Mail mobile application

                                  Stay on top of your schedule
                                  at all times

                                  Carry your calendar with you
                                  Anytime, anywhere

                                        Zoho Sign Resources

                                          Sign, Paperless!

                                          Sign and send business documents on the go!

                                          Get Started Now

                                              Zoho SalesIQ Resources

                                                  Zoho TeamInbox Resources

                                                          Zoho DataPrep Resources

                                                            Zoho DataPrep Demo

                                                            Get a personalized demo or POC

                                                            REGISTER NOW

                                                              Design. Discuss. Deliver.

                                                              Create visually engaging stories with Zoho Show.

                                                              Get Started Now

                                                                                    • Related Articles

                                                                                    • Troubleshooting Mass Emails

                                                                                      1. How can I see how many records are eligible to be sent mass emails? Open the List View, filter the records using the smart filter for "email is not empty", "email is not blocked", "email opt out is not selected". This will give the exact number of ...
                                                                                    • Configuring POP Account

                                                                                      Set up email account via POP3 Zoho CRM lets you configure a Zoho Mail account or a third party email account via POP3. An important point to note here is that Zoho CRM uses Zoho Mail to get emails and display them within CRM. Therefore, whether you ...
                                                                                    • Troubleshooting Email Relay

                                                                                      1. Why am I getting an authentication failure error? Make sure that the password you entered is correct. To verify the password, log in to your webmail with the same password by typing in the password instead of using auto-fill. Check whether TFA is ...
                                                                                    • Troubleshooting BCC Dropbox

                                                                                      1. I have set the search pattern to "Search for the recipient's email address in Contacts and Leads. If there are no matching records, then do not create any new records" but new records are still being created. A new record will be created if the ...
                                                                                    • Troubleshooting Email Authentication

                                                                                      1. I am getting an error which says "DKIM record missing". After entering the public key value in you domain settings page, go to and select TXT. Enter the public key value you generated in CRM and select Lookup. ...
                                                                                    Wherever you are is as good as
                                                                                    your workplace



                                                                                      Watch comprehensive videos on features and other important topics that will help you master Zoho CRM.


                                                                                      Download free eBooks and access a range of topics to get deeper insight on successfully using Zoho CRM.


                                                                                      Sign up for our webinars and learn the Zoho CRM basics, from customization to sales force automation and more.

                                                                                      CRM Tips

                                                                                      Make the most of Zoho CRM with these useful tips.

                                                                                        Zoho Show Resources