Since sending spam is so easy, many scammers will never stop using it, even if it often doesnt work. Still, if you take the right precautions, you can trim your incoming spam emails to a manageable amount.
How long will spam emails last?
The emails in Spam folders are retained for a fixed period of time after which they are permanently deleted. By default, the emails that are older than (or received before) 30 days will be automatically cleared periodically. You can configure this buffer time according to your convenience.
Why is my email spam flagged?
Your IP Address Is or Has Been Used for Spam Even if you never send spam yourself, your emails could get flagged if your IP address was used for spam in the past. If you send your campaigns through an email marketing service, your email is delivered through their servers.