prefixkit Ask an engineerAsk Support RU

SMTP codes

SMTP 552 Exceeded storage allocation

The recipient’s mailbox is full, or the message is too big for it.

552
Class
5xx · Permanent failure
Retried?
No, the message bounces
Defined in
RFC 5321

What to do

How it appears in a bounce

552 Exceeded storage allocation

Paste the full bounce into the decoder — it finds every code and recipient and says what to check.

More tools: dns, ssl & email

DNS lookupAll records plus SPF, DKIM, DMARC and DNSSEC.DNS speed test newWhich public DNS is fastest from your network.DNS zone checker newBIND zone mistakes; export to Cloudflare, Route 53, Terraform.DNS propagationIs a new record visible in 20 countries yet.WHOISRegistrar, dates and status of a domain or IP.Domain health check newDNS, email, SSL, HTTPS, blacklists: graded A–F with fixes.SSL certificate check newExpiry, issuer, names, HTTPS redirect and HSTS.Certificate and CSR decoder newFields, chain order, signatures, key match.CSR generator newCSR and private key in the browser, RSA or ECDSA.SPF & DMARC generator newRecords for Google, Microsoft, Yandex and more.Blacklist checkAn IP or domain against 29 spam lists, plus PTR.HTTP security headers newHSTS, CSP, cookies, redirects and a grade.Email header analyzer newDelivery path, delays, SPF, DKIM, DMARC, spam.DMARC report analyzer newWho sends as your domain; when to set p=reject.SMTP codes & bounce decoder newWhy an email bounced: 550 5.7.1, 5.1.1 and the fix.Email deliverability test newSend a message, get a spam score out of 10.
Idea?