https://groundmail.dev/learn/ Transactional email comparisons, migration guides and deliverability guides from Groundmail. en Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/guides/google-yahoo-microsoft-sender-requirements/ https://groundmail.dev/guides/google-yahoo-microsoft-sender-requirements/ Which Gmail, Yahoo and Outlook.com sender requirements apply to password resets and receipts, the 5,000-a-day bulk thresholds, the 550 5.7.515 rejection, and how to check you comply. Guides Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/compare/amazon-ses/ https://groundmail.dev/compare/amazon-ses/ Amazon SES costs far less per email. Groundmail runs the mail servers, IPs, warmup, webhooks and suppressions for you. Prices, trade-offs and when SES is the better fit. Compare Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/compare/mailgun/ https://groundmail.dev/compare/mailgun/ Groundmail vs Mailgun for transactional email: prices at 50k to 1M emails, free tiers, log retention, dedicated IPs and dedicated servers, and when Mailgun fits better. Compare Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/compare/postmark/ https://groundmail.dev/compare/postmark/ Groundmail vs Postmark: both are transactional-first. Compare list prices, dedicated IPs and servers, free plans, retention and how the send API maps. Compare Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/compare/resend/ https://groundmail.dev/compare/resend/ Groundmail vs Resend: the same list price at every tier, but Groundmail runs its own mail servers and IPs, sends transactional mail only, and offers dedicated servers. Compare Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/compare/sendgrid/ https://groundmail.dev/compare/sendgrid/ Groundmail vs SendGrid for transactional email: free plan vs 60-day trial, prices at 50k to 1M emails, dedicated IPs and servers, overage, API and webhooks. Compare Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/migrate/amazon-ses/ https://groundmail.dev/migrate/amazon-ses/ Move transactional email from Amazon SES to Groundmail: DNS, SendEmail to POST /emails field mapping, SMTP settings, event types to webhooks, suppression export, canary and rollback. Migrate Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/migrate/sendgrid/ https://groundmail.dev/migrate/sendgrid/ Move transactional email from SendGrid to Groundmail: API key, DNS, a full v3 field mapping, SMTP, webhooks, suppression import and a canary cutover with rollback. Migrate Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/compare/postmark-vs-resend/ https://groundmail.dev/compare/postmark-vs-resend/ Postmark vs Resend compared on list price at 10k to 1M emails, free plans, retention, dedicated IPs, marketing email, SDKs and SMTP, plus a third option. Compare Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/guides/shared-vs-dedicated-ip/ https://groundmail.dev/guides/shared-vs-dedicated-ip/ When a dedicated IP helps transactional email and when it hurts, what volume it needs, the difference between a dedicated IP and a dedicated server, and how to move without a dip. Guides Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/guides/spf-dkim-dmarc/ https://groundmail.dev/guides/spf-dkim-dmarc/ What SPF, DKIM and DMARC each check, how alignment works, copy-paste DNS records, dig commands to verify them, the common mistakes, and a safe DMARC rollout plan. Guides Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/guides/best-transactional-email-apis/ https://groundmail.dev/guides/best-transactional-email-apis/ Twelve transactional email APIs compared on prices read from each vendor's pricing page on 2026-10-16: free tiers, 50k, 100k and 1M a month, dedicated IPs and log retention. Guides Fri, 16 Oct 2026 12:00:00 GMT https://groundmail.dev/guides/password-reset-emails-going-to-spam/ https://groundmail.dev/guides/password-reset-emails-going-to-spam/ Why password reset emails land in spam or never arrive: authentication and alignment, new domains, shared IPs, link tracking, suppressions and corporate link scanners, with a fix checklist. Guides Fri, 16 Oct 2026 12:00:00 GMT