Are companies like MailChimp, SendGrid, etc affected the same way?
Yes. I once had issues with emails being rejected by Outlook on MailGun. And it was only Outlook. Had to contact support, they promptly changed my account to another server/IP once I mentioned it was Outlook, sounded like a recurring issue.
alt Hacker News
Yes. I once had issues with emails being rejected by Outlook on MailGun. And it was only Outlook. Had to contact support, they promptly changed my account to another server/IP once I mentioned it was Outlook, sounded like a recurring issue.