Hi,

Gmail SMTP doesn't greet me:

telnet gmail-smtp-in.l.google.com 25
Trying 74.125.24.27...
Connected to gmail-smtp-in.l.google.com.
Escape character is '^]'.
EHLO mx.mydomain.com
452 syntax error (connecting)

About more than 24 hours most of queued mail will be sent at once. Than another outgoing mails will be queued again. We can send email without queue on several domains. But on gmail and yahoo the emails will be queued first. What should I do to solve this issue? The mail server worked almost a month but previously we haven't setup public certificate, DKIM, SPF, DMARC and reverse DNS. Two days ago we setup all of them. But the mails to google still got queued for long time before sending. Thanks.