Delayed Mail Deliver - Mostly to @Yahoo Anonymous 4 months ago updated 4 months ago Answered Seems it's mostly address of contacts @Yahoo which are being delayed.
Sorry for the issues with the delay of your Yahoo email. Yahoo is most likely using a greylisting strategy that is seen when dealing with spam. If this continues to be an issue, please get in touch with our live technical support team. Make sure to include any bounce/delay messages so that they identify the mail server that is affected.
You can also ask that your contacts whitelist you so that their email admins know that your emails are legitimate.