SMTP is a protocol used in sending and receiving emails, it is today completed with POP3 (Post Office Protocol) and IMAP (Internet Message Access Protocol) on the receiving part.
SMTP is a three-steps process:
SMTP is the protocol that governs the interactions between email servers around the world and ensures the deliverability of the 300 billion emails sent every day.
Spam filters are using keyword detection to spot junk emails and make sure your inbox stays clean. This is why you should choose carefully the words used in the subject and body of your emails. Here's is the ultimate list of spam-trigger keyword that you should ban from your email content in 2021!