Contact

Real Humans, Real Replies.

Name: MailRoundup
Address: 548 Market Street, Suite 22047, San Francisco, CA, 94104, US

Whether you have a deliverability question, a pricing question, or a problem that needs a person on it, we would like to hear from you.

Support

Mailing Address

MailRoundup
548 Market Street, Suite 22047
San Francisco, CA 94104

From the guides

Before you write in.

A few of the guides most teams read before their first conversation with us.

February 18, 2026
Gmail And Yahoo Sender Requirements: What Changed In 2024
The February 2024 Gmail and Yahoo bulk sender rules, what they enforce, and how they apply to transactional email in 2026.
Read guide →
February 11, 2026
SPF, DKIM, And DMARC Explained For Developers
A practical, RFC-grounded walkthrough of the three email authentication standards every transactional sender has to get right.
Read guide →
February 4, 2026
Best Email Verification APIs For Sending Verification Codes
A developer-focused comparison of the APIs teams reach for when a user clicks send me a code and the whole product depends on that code arriving.
Read guide →