The following guide will assist in testing your email against looking like spam.
This is not a foolproof guide but will assist in most areas to improve the deliverability of your emails.
Goto this link www.mail-tester.com
An email will be generated on this page, copy the email and paste into your test list you have set up for testing email campaigns.
Send a test campaign to your test email list.
Once the campaign is sent, head over to the link where you copied the email address above. Click on Check your score Button.
The results of the email sent will be displayed as per the screenshot below.
Open each point to see how you can improve your email or setup.
Then rerun the test with a new email until your score improves.
Once you are done, you can then send out your campaign to your subscribers.
Note: The test emails are generated once, so you should remove them when you are done.