Special note for ReSales-Online accounts using Zoho
Zoho upgraded their security and changed the way they allow SMTP usage. This will apply to you if you have selected the email setting "sending emails via your own email server from individual accounts and using Zoho as your SMTP host".
The changes that Zoho have made means that you currently might not be able to send automatic email (profile matches) or manual emails to clients from the system. If this is the case, you will be receiving an error message like: error Verify SMTP Username / SMTP Password
This solution requires enabling multi-factor authentication (MFA).
Then, do the following steps.
Sign in to your Zoho account.
Click Application Specific Passwords under Security.
Click Generate New Password.
Enter a name for the application you want to create a password for, then click Generate.
Make a note of the generated password, as for security purposes it will not be displayed again.
This is the only way this process will work.
If you need help with the above, please speak to your technical person that usually helps you with your email setup.