Email SMTP is delay in sending emails

Hi @eva2000 , I am having trouble sending transactional woocommerce emails There is a delay of almost 60 seconds in delivery. I have tested two sites on my server running on centminmod using WP Mail SMTP plugin. In both the sites, there was the issue of delay. While i have another website on a shared host and it is working fine with SMTP and sending emails fast enough.
I think there is some filter or something in centminmod that is causing the delay

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I am using WP Mail SMTP plugin where there is the option to select google apps to configure SMTP. I did that. I am getting the transactional emails but they are too late. like a delay of more than 1minute.

I am using Cloudflare. I have setup SPF, DKIM, and DMARC right now in cloudflare DNS section. till now i havenot setup PTR, i have contacted my hosting about this .
@eva2000 , I just want to use use SMTP smoothly for transactional emails.

 

I have signed up for Amazon SES. They are reviewing my account now.
now when i check the SPF lookup of zepper.in then it's showing error that SPF record was not found.
and when i check for hostname.zepper.in i can see find the SPF record.
Is it normal? or do i need to add anything to

Code:

v=spf1 a mx ~all

or add any other DNS

The DKIM is for hostname.zepper.in, How can i generate it for domain only(zepper.in)? How can i check the DKIM is working?

When I check the email header, Its showing error SPF: Neutral and DMARC: FAIL

 

Also i'm getting a zero score here Spam Test Result

 

hi @eva2000 , thank you for your fast response. I have successfully setup the email in my server. Now i have one question,I made a few transactional emails on few of my own gmail accounts.
I found i received one email notification into the inbox where SPF and DMARC are passed. and in another email, i receive it in the promotional section of Gmail. There the SPF i neutral and DMARC failed.
Can you tell me why this is happening? How can i solve it.