Mails bounced back sometimes, sometimes not

hey there

first, excuse my english

i do this in my dny settings

MX	@	mx.zoho.eu	-
MX	@	mx2.zoho.eu	-
MX	@	mx3.zoho.eu	-
SPF (TXT)	@	"v=spf1 include:eu-sender.zohobooks.com include:zoho.eu ~all"	-
TXT	@	"zoho-verification=zb15774556.zmverify.zoho.eu"	-

i created three mail accounts.

main account works fine

the 2nd and 3rd are doesnt work

for a second it works and i got an email. now it stops working.