Why shouldn't I use a public domain address?

Why shouldn't I use a public domain address?

An email from a public domain sender address may make recipients hesitate to read your email, and they may even mark it as spam.
Spammers often use public domains for their sender addresses therefore their domain reputation tends to be low. Using a free domain sender address increases the chances of your emails to be classified as spam or junk. 
To prevent spam messages getting through, many email services follow DMARC policy to protect their domain reputations. This means that when you use public domains, there is a risk that emails will be bounced or quarantined automatically.

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