ok so i put the new serveur 1/2 hours
no mail
i check the mxtoolbox
https publigo1.com The Certificate is invalid More Info
dns publigo1.com Name Servers are on the Same Subnet More Info
dns publigo1.com SOA Expire Value out of recommended range More Info
smtp mail.publigo1.com Reverse DNS is not a valid Hostname More Info
do not look again now ! I put back the older server A
does this Q help ?