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A bounce is different from mail quietly landing in spam: something actively rejected your message and told you why. That is genuinely useful, because the rejection notice almost always contains the diagnosis — and businesses that learn to read it solve in ten minutes what otherwise becomes a week of guessing and blaming the recipient.
What matters here
- Hard versus soft bounces — permanent rejection or a temporary condition.
- The error text names the cause — address unknown, mailbox full, message rejected by policy.
- Sending reputation — rejections that mention blocking or reputation are a different problem entirely.
- Configuration — missing authentication records cause rejections that look like the recipient's fault.
The main options
Start by reading the bounce message rather than forwarding it to your IT contact unread. Unknown address means a typo or a departed employee. Mailbox full is the recipient's problem and resolves itself. Rejections mentioning policy, blocking or reputation point at your sending configuration — and that is where email on your own domain with correct authentication records matters, because you cannot fix authentication on a free webmail account. If bounces began after a hosting or DNS change, the records were probably lost in the move, which is the most common cause of a sudden onset. Bulk sending belongs on a marketing platform rather than your business mailbox, precisely so campaign complaints never damage the reputation your invoices depend on.
How to choose
Test deliberately rather than waiting for complaints: send to accounts on the major mail providers and see what arrives, what bounces and what lands in spam. If rejections mention your domain or server reputation, ask your host to verify the authentication records — routine work for them, and usually the entire fix. And keep the habit of reading bounce text; it is the only diagnostic information you get for free.