# ZevSend Blog

> Notes from the team building ZevSend: deliverability, email infrastructure, and what breaks when you ship transactional messaging for real products.

ZevSend is a developer API for transactional email, SMS, WhatsApp, and verification codes: https://www.zevsend.com. Documentation: https://docs.zevsend.com. This file indexes the blog at https://blog.zevsend.com.

## Deliverability

Why email lands in spam, and what actually fixes it. DNS, sender reputation, bounce handling, and the rules Gmail and Yahoo enforce.

- [14 edge cases that quietly destroy transactional email](https://blog.zevsend.com/14-edge-cases-transactional-email): Fourteen production failure modes that never show up in testing: retry duplicates, late OTPs, alignment failures, the Gmail and Yahoo thresholds, bounce handling done backwards, and the it-works-in-testing trap.
- [Your WooCommerce order emails are going to spam. Here is the fix](https://blog.zevsend.com/woocommerce-order-emails-going-to-spam): Why WooCommerce order confirmations land in spam, how to confirm the diagnosis in Gmail in one minute, and the two-part fix that ends it: a real sending service plus the DNS records that prove your domain.
- [SPF, DKIM, DMARC, and MX in plain English](https://blog.zevsend.com/spf-dkim-dmarc-mx-plain-english): The four DNS records behind every email your product sends, explained with one mental model, real record examples, and the failure modes that put authenticated mail in spam anyway.

## Guides

Plain-English walkthroughs of the things every product that sends email has to get right.

- [How to test email in development without spamming real people](https://blog.zevsend.com/test-email-in-development): A four-level ladder from local capture servers to sandboxed providers and stranger-proof staging, plus the five email assertions that actually catch production bugs.
- [The 12 emails every product has to send](https://blog.zevsend.com/12-emails-every-product-has-to-send): Verification, resets, receipts, dunning, invites, security alerts: the twelve transactional emails no product escapes, what belongs in each one, and the production failure each one is known for.

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