"Yahoo used to have huge mailbox limits, from when they were competing with gmail on that checkbox feature. A terabyte or more. They've recently reduced them to 20 GB - which is a lot less so there will have been a lot of users who were suddenly over the new quota. Yahoo notified users about these changes and explicitly notified any users who are over the new quota, and they gave them a grace period to clean up their mailboxes."
"That grace period seems to have expired, and so there's been a recent spike of rejections due to mailboxes being full. Those users with full mailboxes won't be receiving any new mail, and will have had plenty of notifications from Yahoo to clean things up. They haven't. It's fairly safe to assume that those mailboxes have been abandoned, probably for years. Or decades."
Yahoo reduced legacy mailbox limits from terabytes to 20 GB, leaving many users suddenly over quota. Yahoo sent notifications and provided a grace period for affected accounts to clean up mailboxes. The grace period has apparently expired, producing a spike in SMTP 552 5.2.2 hard bounces for full mailboxes. Accounts that reached the reduced quota stop receiving new mail and often receive multiple cleanup notices. Many of these full mailboxes appear abandoned and may be years or decades old. Mail senders should suppress recipients that hard-bounce as full and evaluate recipient engagement to find other inactive addresses.
Read at Wordtothewise
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