I have a small client with a large email list who wants to switch from once a month constant contact newsletters to sending them through SES with a self-hosted Sendy instance. This seemed like a reasonable way to save $10k a year or so. I haven't used SES before for anything. I have run an email server for 30 years and had occasional blacklist headaches, but it's not used for mass mailing of that sort... it's usually several years between problems. Is this a terrible idea to switch, even if it's off a "managed" SES dedicated IP? I don't want to switch them and find out no one on Outlook is getting their mail.