What is Spam Email?
Spam is a type of email that was not granted verifiable permission by the recipient. It is also referred as "Unsolicited Bulk Email".
How can Spam Email be prevented and avoided?
Only send emails to recipients that have signed-up for your marketing emails.
To ensure that your new subscribers receive all future emails, make sure to send a welcome email that includes a reminder to add your domain to their address book and to their "Safe sender" list.
You could also increase your open rate by personalizing your subject line with the recipients name
Only send emails from a company domain and avoid using personal email providers such as yahoo, gmail, etc
Add your domain to postmaster https://support.google.com/mail/answer/188131?p=UnsolicitedMessageError&visit_id=637340711220125071-1728520428&rd=1
Setup your DKIM integration http://help.honeycrm.com/en/articles/2477372-dkim
Avoid using spam words in your emails. Examples of spam word include :
Earn extra cash
Info you requested
Limited time offer
Auto email removal
Compete for you business
8. Make sure your company domain isn't blacklisted on a regular basis. https://mxtoolbox.com/
9. Check your email spam score before sending https://spamcheck.postmarkapp.com
10. Setup DMARC in your DNS account