Inbox-Ready Bulk Email Setup

I need a dependable bulk-sending environment that pushes every personalised message straight into the primary inbox—even at high volumes. When the form asked about the campaign’s main purpose I simply typed “hi”; the real priority is deliverability, not labels... (Budget: £20 - £250 GBP, Jobs: Email Campaign, Email Developer, Email Handling, Email Marketing, HTML, Mailchimp, PHP, SendGrid)