How to change nameservers safely

Hi,
how can I be sure that after changing my nameservers on my register to point at Cloudflare nameservers the emails will work correctly?
As I can see from the Cloudflare DNS panel some DNS rules are automatically created:


here my dns panel:

bc.premispa.com 
A 	
40.89.152.185
Cancella
booking.premispa.com 
A 	
64.225.69.84
Cancella
dev.premispa.com 
A 	
64.225.69.84
Cancella
dev2.premispa.com 
A 	
64.225.69.84
Cancella
gessate.premispa.com 
A 	
5.89.19.230
Cancella
intranet.premispa.com 
A 	
77.43.96.147
Cancella
itf.premispa.com 
A 	
40.89.152.185
Cancella
la.premispa.com 
A 	
40.85.151.70
Cancella
mail.premispa.com 
A 	
54.76.101.171
Cancella
mx.premispa.com 
A 	
54.76.101.171
Cancella
pdi.premispa.com 
A 	
52.143.171.115
Cancella
pop.premispa.com 
A 	
54.76.101.171
Cancella
posta.premispa.com 
A 	
5.89.19.230
Cancella
premispa.com 
A 	
64.225.69.84
Cancella
presenze.premispa.com 
A 	
5.89.19.230
Cancella
trezzano.premispa.com 
A 	
2.40.115.2
Cancella
webmail.premispa.com 
A 	
5.89.19.231
Cancella
autodiscover.premispa.com 
CNAME 	
autodiscover.outlook.com
Cancella
dns.premispa.com 
CNAME 	
onstatic-it.setupdns.net
Cancella
em8159.premispa.com 
CNAME 	
u30254558.wl059.sendgrid.net
Cancella
enterpriseenrollment.premispa.com 
CNAME 	
enterpriseenrollment.manage.microsoft.com
Cancella
enterpriseregistration.premispa.com 
CNAME 	
enterpriseregistration.windows.net
Cancella
go.premispa.com 
CNAME 	
go.pardot.com
Cancella
k1._domainkey.premispa.com 
CNAME 	
dkim.mcsv.net
Cancella
lyncdiscover.premispa.com 
CNAME 	
webdir.online.lync.com
Cancella
s1._domainkey.premispa.com 
CNAME 	
s1.domainkey.u30254558.wl059.sendgrid.net
Cancella
s2._domainkey.premispa.com 
CNAME 	
s2.domainkey.u30254558.wl059.sendgrid.net
Cancella
sip.premispa.com 
CNAME 	
sipdir.online.lync.com
Cancella
www.dev.premispa.com 
CNAME 	
dev.premispa.com
Cancella
www.premispa.com 
CNAME 	
premispa.com
Cancella
premispa.com 
MX 10 	
spamcloud1.pchiend.it
Cancella

from the first Image you can see also dome “few more steps required to complete my setup”
What I have to do here?

Follow the guide here:

Inside Step 1, point #5 covers what to do if records are missing. Since you appear to have a lot, I would export a BIND file from your current provider and import that to Cloudflare:

Once you do that, all of your records should be imported and then you can follow the rest of the Add a Site guide I linked to above.

Thank you Simon,
so if I copy all rules from my current provider, I will be ok for the emails.

Yes - this will copy all of your DNS settings over from your current provider and therefore all of your DNS records related to email, also.

Something went wrong, My website doesn’t respond couse too many redirect:

www.gida.it

Can you help me to understand why?

same with [my site](http://premispa.com)
do we have to wait for dns propagation? but is strange too many redirect

Make sure you follow this guide for a list of things to check & do to resolve this:

Ok, now I can see the website, but our vpn is off, there is something I can check?
I imported all dns from old provider, what more?


It seems that the import truncate some record name, should it a problem?

Those records are identical - we just don’t show the .premispa.com part of the record name.

You may not want every single record to have the proxy mode ON (orange cloud), read this guide to understand more:

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