Gmail consider the mail as SPAM. How to avoid that?

Obviously Gmail uses Sender-ID and DKIM to verify every email. That is why you need to modify DNS records for your domain using txt record. Here is a tutorial how to do that
You can build your txt records using the wizard and add them. You need something like:
record for in txt: v=spf1 a mx ~all
record for the mail server in txt: v=spf1 a -all

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