Sending from a Yahoo email address? Your newsletter delivery rate might drop

Yahoo began imposing a stricter email validation policy that may unfortunately result in your newsletters landing up in spam or being returned to you as bounced mail.

Why did Yahoo do this?
According to WordToTheWise, “there’s been an ongoing attack against Yahoo users attempting to compromise their accounts and then send email from that Yahoo user to their contacts [...] Yahoo is telling other systems to not accept mail from Yahoo users if it doesn’t come through Yahoo controlled servers. This includes the mail from the attackers, but also mail from regular Yahoo users.”
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