MXDeck: SPF, DKIM & DMARC Monitor for All Your Domains

Watch MX, SPF, DKIM, DMARC, mail server TLS and blacklists for up to 25 domains. A red badge the day one breaks.

Running email on many domains? MXDeck watches the mail setup of all of them and tells you the day one breaks, before your messages start landing in spam. How it works 1. Paste up to 25 domains in the settings. 2. MXDeck checks them right away and then once a day. 3. The icon shows a red or amber badge with the number of domains that need attention. Click it to see every domain with a grade from A to F and the main problem. 4. When a domain gets worse, you get a notification. Click it for the full report with the exact DNS record to fix. What it checks - MX: the domain has mail servers, and mail is not only forwarded - SPF: one record, no +all, and under the 10 DNS lookup limit - DKIM: a key at the common selectors or your own selector, at least 1024 bit - DMARC: a valid record; p=none is flagged as worth fixing - TLS: the mail server's STARTTLS certificate is valid and not about to expire - Blacklists: the mail server IPs on Spamhaus ZEN, SpamCop and Barracuda - Reverse DNS of the mail server Why settings break DNS you set up once does not stay correct by itself: a host migration drops a DKIM key, a new newsletter tool adds a second SPF record, a certificate fails to renew, a hacked mailbox gets the server IP blacklisted. With dozens of domains, something breaks almost every month. MXDeck makes sure you hear about it. Private by design Your domain list stays in your browser. Once a day it is sent to the MXDeck check API, which reads public DNS only. Results are not stored. No account, no email needed. Who it is for Affiliate marketers, domain investors, agencies that host mail for clients and indie hackers with many products. MXDeck is also building a Mac email app: one inbox for every contact@ on every domain, with these checks built in. Get early access at mxdeck.com.