Groundmail Blog https://groundmail.dev/blog/ Practical writing on transactional email from Groundmail. en Sun, 18 Oct 2026 12:00:00 GMT DMARC fail: what it means and how to fix it https://groundmail.dev/blog/dmarc-fail/ https://groundmail.dev/blog/dmarc-fail/ DMARC fails when neither SPF nor DKIM passes for a domain that matches your From address. How to read the headers, find the failing sender and fix each cause. DMARC Authentication Troubleshooting Sun, 18 Oct 2026 12:00:00 GMT How to send email with Python https://groundmail.dev/blog/send-email-python/ https://groundmail.dev/blog/send-email-python/ Send email in Python with the standard library's smtplib and STARTTLS, or with an HTTP email API. Includes HTML, attachments, common errors and production tips. Python SMTP Transactional email Sun, 18 Oct 2026 12:00:00 GMT How to switch transactional email providers without downtime https://groundmail.dev/blog/switch-transactional-email-providers-without-downtime/ https://groundmail.dev/blog/switch-transactional-email-providers-without-downtime/ A safe order for moving transactional email to a new provider. Set up DNS first, send through both providers for a while, then cut over with a rollback ready. Migration DNS Deliverability Sun, 18 Oct 2026 12:00:00 GMT Password reset email not received: a debugging checklist https://groundmail.dev/blog/password-reset-email-not-received/ https://groundmail.dev/blog/password-reset-email-not-received/ When users don't get password reset emails, check whether it was sent, bounced or suppressed, landed in spam, failed authentication, or had its link used by a scanner. Transactional email Deliverability Troubleshooting Sun, 18 Oct 2026 12:00:00 GMT SMTP relay service: how to choose one https://groundmail.dev/blog/smtp-relay-service/ https://groundmail.dev/blog/smtp-relay-service/ An SMTP relay service sends your app's email through authenticated, reputable mail servers. What to compare, when to use an HTTP API instead, and a setup example. SMTP Transactional email Deliverability Sun, 18 Oct 2026 12:00:00 GMT Why are my emails going to spam? https://groundmail.dev/blog/why-are-my-emails-going-to-spam/ https://groundmail.dev/blog/why-are-my-emails-going-to-spam/ Emails usually land in spam because of failed or unaligned SPF, DKIM and DMARC, a poor sender reputation or blocklisting, or high complaints. How to find which. Deliverability DMARC Troubleshooting Sun, 18 Oct 2026 12:00:00 GMT