Company
SendGrid is a cloud-based email delivery platform, owned by Twilio, used to send transactional and marketing emails via API or SMTP.
GitHub's SPF record uses all 10 DNS lookups RFC 7208 allows once the includes inside its vendors' records are counted. One more mail vendor would make SPF return PermError and leave GitHub's mail to pass DMARC on DKIM alone.
Reality
Amazon's July 2026 overhaul left most existing SES senders on legacy pricing until they opt in. The Pro tier they would opt into bills a base fee per region, and its dedicated IP needs 45 days of warm-up before it isolates anything.
Reality
AWS replaced the SES flat rate with three plans on July 21, 2026, so the same 100,000-email month now costs $16 on Essentials, $127 on Pro, $126 on Postmark's Platform, and somewhere between $110 and $200 on SendGrid.
Reality
Presence and enforcement are different questions, and the free checkers only answer the first. The switches that matter are the qualifier on SPF's all term and DMARC's p=, sp= and pct= tags.
Reality
Free quotas expire on the vendor's schedule, and on AI platforms that schedule is measured in months. The exit costs more than re-plumbing, so it belongs in the integration budget.
Reality
Free React Email designs plus three agent instruction files put Resend's sending API one step away, reached before any human sits down to compare providers.
Reality