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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteA “250 OK” reply does not guarantee that a message reached a recipient’s inbox. It means the receiving SMTP server accepted the message at a particular point in the SMTP transaction; delivery can still fail later and generate a non-delivery notification. The title’s figures—50 messages and 12 bounces, or 24%—describe the reported sample, not a verified or typical bounce rate. Without the bounce notices and transaction logs, the reason for those failures cannot be determined.
What does 250 OK mean in email?
SMTP uses 250 replies at more than one stage, so the command associated with the reply matters. When the receiving server sends 250 after successfully receiving the message text, it has accepted responsibility to deliver or relay the message. RFC 5321 states: “When the receiver-SMTP accepts a piece of mail (by sending a "250 OK" reply), it accepts responsibility for delivering or relaying the message.” RFC 5321, §6.1
That is a protocol-level acceptance, not proof of inbox placement, opening, or reading. The server may encounter a delivery problem after accepting the message and report it in a later non-delivery notification; the RFC describes that possibility in its discussion of delivery failures. RFC 5321
Why did my email bounce after 250 OK?
A later failure is consistent with SMTP acceptance: the receiving server accepted the message, but a subsequent delivery attempt did not succeed. The bounce’s diagnostic text and enhanced status code are the key evidence for identifying what happened. The reported count—12 of 50 messages—does not reveal the cause by itself, and the 250 response should not be assumed to have caused the later failures.
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Possible explanations cannot be distinguished from the headline alone. The original bounce notices, complete SMTP transaction logs, recipient domains, and sender configuration are needed. In particular, note whether the 250 reply came after message data or at an earlier SMTP stage.
Does 250 OK mean the email was delivered?
No. It means the server accepted the message at that stage of the SMTP exchange. It does not establish that the message reached the final mailbox, appeared in the inbox rather than another folder, or was seen by a person. A subsequent non-delivery notification is one way a later failure may be reported.
How do I find out why an email bounced?
- Preserve the evidence. Save the complete bounce notice and the sending system’s SMTP transaction log. Record the recipient domain, timestamp, SMTP stage, full server reply, and enhanced status code.
- Group similar failures. Compare notices by recipient domain and exact diagnostic text. Treat a failure as permanent or temporary only when the returned status details support that classification.
- Check the requirements for the recipient provider. For messages to personal Gmail accounts, Google says all senders must use SPF or DKIM, have valid forward and reverse DNS, use TLS, format messages according to RFC 5322, and keep spam rates reported in Postmaster Tools below 0.3%. Google’s Gmail sender guidelines
- Apply the Gmail rules that match your sending volume. For senders exceeding 5,000 messages per day to Gmail accounts, Google specifies SPF and DKIM, DMARC, aligned From-domain authentication for direct email, and one-click unsubscribe for marketing or subscribed messages. These are Google’s stated requirements for its Gmail audience, not universal rules for every provider. Google’s Gmail sender guidelines
- Review Gmail sender-level data when relevant. Google Postmaster Tools provides Gmail-specific information about authentication, domain and IP reputation, spam rate, encryption, and delivery errors. Its dashboards are not real time, may show limited data at low volume, and do not explain an individual bounce or diagnose non-Gmail delivery. Google Postmaster Tools
- Make one evidence-based change at a time. Compare later bounce notices and delivery-error data after a configuration or sending-practice change. Do not attribute an improvement to that change without follow-up evidence.
What the 24% figure can—and cannot—tell you
Twelve bounces among 50 reported messages is the arithmetic implied by the title. The available account does not include independent verification of the send records or bounce notices, so the figure should not be treated as a typical rate or as proof of a particular deliverability problem. To diagnose this sample, the most useful next evidence is the actual status codes and diagnostics, grouped by recipient provider and SMTP stage.
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