My server host has informed me that Yahoo has massively throttled emails send from CiviMail (and thus we may be close to being blacklisted).
I have created a temporary smart group for all yahoo email addresses, to exclude from all mailings for the time being - but obviously just excluding all yahoo recipients forever is not an optimal solution to this problem.
I'm not getting bounces from this list. It's about 20,000 recipients total, about 4k of which are yahoo addresses. We send about 1-3 emails every other week or so.
Does anyone have any ideas on a workaround to maybe throttle the email delivery to Yahoo addresses separately from the rest of our list, or otherwise convince Yahoo that we're not spamming them?