systemctl disable --now sendmail
systemctl disable --now postfix

systemctl disable --now ufw

Although I have opened all needed ports as required 


I have the following serices running 

systemctl list-units "carbonio*"
  UNIT                                               LOAD   ACTIVE SUB     DESCRIPTION                                       
  carbonio-catalog-sidecar.service                   loaded active running Carbonio Catalog sidecar proxy                    
  carbonio-catalog.service                           loaded active running Carbonio Catalog daemon                           
  carbonio-clamav-sidecar.service                    loaded active running Carbonio clamav sidecar proxy                     
  carbonio-clamav-signature-provider-sidecar.service loaded active running NGINX Carbonio ClamAV signature provider sidecar  
  carbonio-docs-connector-db-sidecar.service         loaded active running Carbonio Docs Connector database sidecar          
  carbonio-docs-connector-sidecar.service            loaded active running Carbonio docs connector sidecar proxy             
  carbonio-docs-connector.service                    loaded active running Carbonio docs connector daemon                    
  carbonio-docs-editor-sidecar.service               loaded active running Carbonio Docs server sidecar proxy                
  carbonio-docs-editor.service                       loaded active running Carbonio Docs Server                              
  carbonio-files-db-sidecar.service                  loaded active running Carbonio Files database sidecar                   
  carbonio-files-sidecar.service                     loaded active running Carbonio Files sidecar proxy                      
  carbonio-files.service                             loaded active running Carbonio Files daemon                             
  carbonio-mailbox-admin-sidecar.service             loaded active running Carbonio Mailbox Admin proxy sidecar              
  carbonio-mailbox-db-sidecar.service                loaded active running Carbonio Mailbox database sidecar                 
  carbonio-mailbox-nslookup-sidecar.service          loaded active running Carbonio Mailbox NSLookup proxy sidecar           
  carbonio-mailbox-sidecar.service                   loaded active running Mailbox carbonio proxy sidecar                    
  carbonio-message-broker-sidecar.service            loaded active running Carbonio message broker sidecar proxy             
  carbonio-message-broker.service                    loaded active running Carbonio message broker daemon                    
  carbonio-message-dispatcher-auth-sidecar.service   loaded active running Carbonio Message Dispatcher auth sidecar proxy    
  carbonio-message-dispatcher-auth.service           loaded active running Carbonio Message Dispatcher auth daemon           
  carbonio-message-dispatcher-db-sidecar.service     loaded active running Carbonio Message Dispatcher database sidecar      
  carbonio-message-dispatcher-http-sidecar.service   loaded active running Carbonio Message Dispatcher HTTP sidecar proxy    
  carbonio-message-dispatcher-xmpp-sidecar.service   loaded active running Carbonio Message Dispatcher XMPP sidecar proxy    
  carbonio-message-dispatcher.service                loaded active running Carbonio Message Dispatcher daemon                
  carbonio-mta-sidecar.service                       loaded active running Carbonio mta sidecar proxy                        
  carbonio-preview-sidecar.service                   loaded active running Carbonio Preview sidecar proxy                    
  carbonio-preview.service                           loaded active running Carbonio Preview daemon                           
  carbonio-prometheus-consul-exporter.service        loaded active running Carbonio Prometheus Consul exporter               
  carbonio-prometheus-mysqld-exporter.service        loaded active running Carbonio Prometheus MySQL exporter                
  carbonio-prometheus-nginx-exporter.service         loaded active running Carbonio Prometheus NGINX exporter                
  carbonio-prometheus-node-exporter.service          loaded active running Carbonio Prometheus Node Exporter                 
  carbonio-prometheus-openldap-exporter.service      loaded active running Carbonio Prometheus OpenLDAP exporter             
  carbonio-proxy-sidecar.service                     loaded active running NGINX carbonio proxy sidecar                      
  carbonio-storages-sidecar.service                  loaded active running Storages-CE sidecar proxy                         
  carbonio-storages.service                          loaded active running Carbonio Storages-CE daemon                       
  carbonio-tasks-db-sidecar.service                  loaded active running Carbonio Tasks database sidecar                   
  carbonio-tasks-sidecar.service                     loaded active running Carbonio Tasks sidecar proxy                      
  carbonio-tasks.service                             loaded active running Carbonio Tasks daemon                             
  carbonio-user-management-sidecar.service           loaded active running Carbonio User Management sidecar proxy            
  carbonio-user-management.service                   loaded active running Carbonio User Management daemon                   
  carbonio-videoserver-sidecar.service               loaded active running Carbonio Videoserver sidecar proxy                
  carbonio-videoserver.service                       loaded active running Zextras Videoserver                               
  carbonio-ws-collaboration-db-sidecar.service       loaded active running Carbonio Workstream Collaboration database sidecar
  carbonio-ws-collaboration-sidecar.service          loaded active running Carbonio Workstream Collaboration sidecar proxy   
  carbonio-ws-collaboration.service                  loaded active running Carbonio Workstream Collaboration daemon          
  carbonio.service                                   loaded active exited  LSB: Carbonio Services                            

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

46 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.

I have confirmed I have the correct DMARC, DKIM and SPF records with MxToolBox

I can also confirm I have the following zmcontrol services running

su - zextras 
zextras@mail:~$ zmcontrol status
Host mail.mydomain.com
	antivirus               Running
	directory-server        Running
	mailbox                 Running
	memcached               Running
	mta                     Running
	proxy                   Running
	service webapp          Running
	service-discover        Running
	stats                   Running
	config service          Running
zextras@mail:~$ 

I have tried to request an SSL certificate via Lets encrypt on the Virtual Hosts section of the admin gui but have not managed to get it
I dont know what I am missing

Here Are some of my carbonio logs I get when sending an email

ec 28 14:28:23 mail postfix/smtpd: connect from localhost:39120
Dec 28 14:28:23 mail postfix/smtpd: lost connection after CONNECT from localhost:39120
Dec 28 14:28:23 mail postfix/smtpd: disconnect from localhost:39120 commands=0/0
Dec 28 14:28:33 mail postfix/postscreen: CONNECT from :46182 to :25
Dec 28 14:28:33 mail postfix/postscreen: ALLOWLISTED :46182
Dec 28 14:28:33 mail postfix/smtpd: connect from localhost:46182
Dec 28 14:28:33 mail postfix/smtpd: lost connection after CONNECT from localhost:46182
Dec 28 14:28:33 mail postfix/smtpd: disconnect from localhost:46182 commands=0/0
^[Dec 28 14:28:40 mail postfix/anvil: statistics: max connection rate 1/60s for (submission:*************) at Dec 28 14:19:31
Dec 28 14:28:40 mail postfix/anvil: statistics: max connection count 1 for (submission:*************) at Dec 28 14:19:31
Dec 28 14:28:40 mail postfix/anvil: statistics: max cache size 2 at Dec 28 14:20:28
Dec 28 14:28:40 mail postfix/smtp: fatal: specify a password table via the `smtp_sasl_password_maps' configuration parameter
Dec 28 14:28:40 mail postfix/smtp: fatal: specify a password table via the `smtp_sasl_password_maps' configuration parameter
Dec 28 14:28:41 mail postfix/master: warning: process /opt/zextras/common/libexec/smtp pid 302466 exit status 1
Dec 28 14:28:41 mail postfix/master: warning: /opt/zextras/common/libexec/smtp: bad command startup -- throttling
Dec 28 14:28:41 mail postfix/master: warning: process /opt/zextras/common/libexec/smtp pid 302465 exit status 1
Dec 28 14:28:41 mail postfix/master: warning: /opt/zextras/common/libexec/smtp: bad command startup -- throttling
Dec 28 14:28:42 mail zmconfigd: Fetching All configs
Dec 28 14:28:42 mail zmconfigd: All configs fetched in 0.07 seconds
Dec 28 14:28:43 mail zmconfigd: Command not defined for directory-server
Dec 28 14:28:43 mail postfix/postscreen: CONNECT from :40038 to :25
Dec 28 14:28:43 mail postfix/postscreen: ALLOWLISTED :40038
Dec 28 14:28:43 mail postfix/smtpd: connect from localhost:40038
Dec 28 14:28:43 mail postfix/smtpd: lost connection after CONNECT from localhost:40038
Dec 28 14:28:43 mail postfix/smtpd: disconnect from localhost:40038 commands=0/0
Dec 28 14:28:43 mail /postfix-script: the Postfix mail system is running: PID: 266886
Dec 28 14:28:44 mail zmconfigd: Command not defined for service-discover
Dec 28 14:28:45 mail zmconfigd: Watchdog: service antivirus status is OK.
Dec 28 14:28:45 mail zmconfigd: All rewrite threads completed in 0.00 sec
Dec 28 14:28:45 mail zmconfigd: All restarts completed in 0.00 sec
Dec 28 14:28:53 mail postfix/postscreen: CONNECT from :39422 to :25
Dec 28 14:28:53 mail postfix/postscreen: ALLOWLISTED :39422
Dec 28 14:28:53 mail postfix/smtpd: connect from localhost:39422
Dec 28 14:28:53 mail postfix/smtpd: lost connection after CONNECT from localhost:39422
Dec 28 14:28:53 mail postfix/smtpd: disconnect from localhost:39422 commands=0/0
Dec 28 14:29:03 mail postfix/postscreen: CONNECT from :44670 to :25
Dec 28 14:29:03 mail postfix/postscreen: ALLOWLISTED :44670
Dec 28 14:29:03 mail postfix/smtpd: connect from localhost:44670
Dec 28 14:29:03 mail postfix/smtpd: lost connection after CONNECT from localhost:44670
Dec 28 14:29:03 mail postfix/smtpd: disconnect from localhost:44670 commands=0/0
^[Dec 28 14:29:12 mail postfix/postscreen: CONNECT from :59364 to :25
Dec 28 14:29:12 mail postfix/postscreen: ALLOWLISTED :59364
Dec 28 14:29:12 mail postfix/smtpd: connect from localhost:59364
Dec 28 14:29:12 mail postfix/smtpd: lost connection after CONNECT from localhost:59364
Dec 28 14:29:12 mail postfix/smtpd: disconnect from localhost:59364 commands=0/0
Dec 28 14:29:12 mail clamd: SelfCheck: Database status OK.
Dec 28 14:29:13 mail postfix/postscreen: CONNECT from :59378 to :25
Dec 28 14:29:13 mail postfix/postscreen: ALLOWLISTED :59378
Dec 28 14:29:13 mail postfix/smtpd: connect from localhost:59378
Dec 28 14:29:13 mail postfix/smtpd: lost connection after CONNECT from localhost:59378
Dec 28 14:29:13 mail postfix/smtpd: disconnect from localhost:59378 commands=0/0