Sure, this is the tag used for calling headers:

Can you please post your CFML code for cfpop (hiding of course any sensitive information)?

Again, work arounds have been found, as for example using java directly, but things arent supposed to be this complicated I believe.

<cfset javaSystem = createObject("java", "java.lang.System") />
<cfset jProps = javaSystem.getProperties() />
<cfset jProps.setProperty("mail.pop3.socketFactory.class", "javax.net.ssl.SSLSocketFactory") />
<cfset jProps.setproperty("mail.pop3.port",995) />
<cfset jProps.setProperty("mail.pop3.socketFactory.port", 995) />

<cfset msession = createObject("java", "javax.mail.Session")>

<cfset m2 = msession.getDefaultInstance(jprops)>
<cfset store = m2.getStore("pop3")>
<cfset store.connect("pop.gmail.com","themail@gmail.com","thepassword")>
<cfset df = store.getFolder("INBOX")>
<cfset df.open(df.HOLDS_MESSAGES)>
<cfset msgs = df.getMessages()>

With this, the session gets created directly and logs in.

now, by using the getMessages() method within the variable the I named "msgs" I can use any method that I need and populate the strings or any value to a new query object.
In this example I populated the query object that is created en <cfpop action="getheadersonly"....... > is used:

<cfset get_emails = queryNew("subject,from,MessageNumber,date", "varchar,varchar,int,date")>

<cfloop index="i" from = "1" to = "#df.getMessageCount()#">
<cfscript>
queryAddRow(get_emails);
querySetCell(get_emails, "subject", "#msgs[i].getSubject()#");
querySetCell(get_emails, "from", "#msgs[i].getFrom()[1].toString()#");
querySetCell(get_emails, "MessageNumber", "#msgs[i].getMessageNumber()#");
querySetCell(get_emails, "date", "#msgs[i].getSentDate()#");
</cfscript>
</cfloop>

If get_emails is dumped, a query object with the same properties as the cfpop tag "getheadersonly" will be shown, and better yet, if you need to add any other thing to the query object you may use any of the methods in the "msgs" function too right there to simplify things.