How to avoid spam filters when sending cold emails?

Warm your sending domain for at least 3 weeks before launching sequences, keep daily send volume under 50 per mailbox, and authenticate every domain with SPF, DKIM, and DMARC before touching a single prospect. Use plain-text or minimal-HTML emails, personalise the first line for each prospect, and keep your list clean: bounce rates above 3% will tank your sender score fast. OnyxSend handles warmup, authentication checks, and bounce scrubbing automatically so your pipeline stays full and your domain stays out of the junk folder.

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