Fix "550 5.7.1 SPF permerror": SPF has a permanent error (too many DNS lookups)

Getting 550 5.7.1 SPF permerror? It means SPF has a permanent error (too many DNS lookups).

How to fix it

Flatten SPF to stay under the 10-lookup limit.

Prevent it

• Authenticate with SPF, DKIM and DMARC.
• Use a dedicated IP.
• Keep bounce and complaint rates low.

How Rainmail helps

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