Fix "554 5.7.1": Your message or IP was blocked by the receiving server

If your email is bouncing with 554 5.7.1, it means your message or IP was blocked by the receiving server. Here is exactly what causes it and how to fix it.

What 554 5.7.1 means

554 5.7.1 is a firm block. The receiver has decided not to accept your mail, most often because your IP/domain is blocklisted or your DMARC/SPF check failed.

How to fix 554 5.7.1

• Delist your IP from any blocklists and fix the root cause.
• Pass DMARC with aligned SPF or DKIM.
• Move to a dedicated, reputation-clean IP if you are on a bad shared pool.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI that watches your list health and deliverability. It also welcomes the senders Amazon SES, SendGrid and Mailchimp reject — from $8, cheaper per email than SES. Run the free 10-second checker or see plans.