I used the Google's "Check MX" application to check the functioning our website's MX records. It showed a critical error:
Status: ERR aspmx.l.google.com MUST be the first MX record. Your setup 10 alt1.aspmx.l.google.com 20 alt2.aspmx.l.google.com 30 aspmx2.googlemail.com 30 aspmx3.googlemail.com 30 aspmx4.googlemail.com 30 aspmx5.googlemail.com Recommended setup 1 ASPMX.L.GOOGLE.COM. 5 ALT1.ASPMX.L.GOOGLE.COM. 5 ALT2.ASPMX.L.GOOGLE.COM. 10 ALT3.ASPMX.L.GOOGLE.COM. 10 ALT4.ASPMX.L.GOOGLE.COM.
Right now we are receiving emails and are able to send them as well.
My question is if we go ahead and update the MX records, will we stop receiving emails till the time of DNS propagation. Or will the transition be seamless since we already have a working DNS setting?