3 ms·Mass sending is controlled by sendgrid and the likes of that.by 77pt77 3y agoMass sending is controlled by sendgrid and the likes of that.patja 3y agoSendgrid is no silver bullet for deliverability. They have many IP addresses listed in blocklists. https://check.spamhaus.org/sbl/listings/sendgrid.com/ https://check.spamhaus.org/sbl/listings/sendgrid.com/77pt77 3y agoCuriously my domain shows as zero but it's part of at least one RBL.