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There are a couple of reasons why you might run through some issues:
The password entered in Clustdoc is not the right one
You haven't yet clicked on the 'Confirm' button in the confirmation email sent from Clustdoc after you've entered your SMTP settings
SMTP username and SMTP sender email are different in Clustdoc (see below)
You do not have yet a Clustdoc account with SMTP activated
Your confirmation was sent to your spam folder
Your confirmation email was sent to your Clustdoc user email inbox (and you've checked your email sender's inbox)
Your email client is not delivering your Clustdoc emails anymore (Re set up your SMTP)
If your CNAME looks right, and you have waited for a couple of hours for it to update, contact your registrar to ask why the CNAME is not propagated yet if it has been set up correctly.
Any issues?
Here are some tips to troubleshoot the most frequent issues with SMTP and email deliverability. Remember that using a professional SMTP service can help you solve most issues.
Check again your username and password.
SMTP normally uses port 25, but it may happen to be blocked by your ISP: try switch to port 587 (or port 465 if you’re connecting via SSL).
The SMTP settings are mistaken. Maybe you configured your mail client with a wrong outgoing server name.
Firewall or antivirus issues. Make sure that you have an exception rule for your SMTP service in your firewall, proxy service or antivirus settings.
If you keep running into issues, it’s likely that you have a general issue with your Internet Service Provider (which you should contact immediately).
We made up a list of the most common email providers, in order to help you set up your SMTP configuration more easily.
More tips for Gmail / Gsuite users
Using Gmail/Gsuite? Please have a look at the following article https://www.gmass.co/blog/gmail-smtp/