Re: Yahoo banned my IP - Why?
You should not be relying on a free anonymous mail provider for business critical email. It looks unprofessional and frequently results in anomalies such as what you are experiencing now.
That aside, we recently experienced a failure of outgoing mail send from bots in our corporate site (hosted by SiteGround). It turned out to be SiteGround that had instituted a block on all outgoing mail not whitelisted in their anti-spam filter rules. Took a day to figure that out, though.
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